Answer:
Step-by-step explanation:
You are looking for 1/2 of an unknown number minus 19. It will equal -13.
1/2x - 19 = -13
Get x isolated, so add 19 on left to cancel, then add on right) +19 +19
And you now are down to 1/2 x = 6
Now, let's simplify the fraction (1/2). Since it is 1 divided by 2, you reverse division with multiplication. Multiply 1/2 by the denominator (2) and you get 1. So, you're down to 1x, or just x. Then multiply the number on the other side of the equal sign (the 6) by 2 and you get 12.
So x = 12.
Now, let's go back to our original equation and plug in the x and see if it works.
1/2x - 19 = -13
becomes 1/2 (12) - 19 = -13
becomes 6 - 19 = -13
Voila! Our missing number (x) is 12.
Yadira'smom is buying hot dogs and hot dog buns for the family barbecue.
Hot dogs come in packs of 12 and hot dog buns come in packs of 9.
The store does not sell parts of a pack and Yadira's mom wants the same
number of hot dogs as hot dog buns.
What is the smallest total number of hot dogs that Yadira's mom can
nurchase?
Step-by-step explanation:
To find the smallest total number of hot dogs that Yadira's mom can purchase, we need to find the least common multiple (LCM) of 12 and 9, since she wants the same number of hot dogs as hot dog buns.
The multiples of 12 are: 12, 24, 36, 48, 60, 72, 84, 96, 108, 120, ...
The multiples of 9 are: 9, 18, 27, 36, 45, 54, 63, 72, 81, 90, ...
The least common multiple of 12 and 9 is 36, since it is the smallest number that appears in both lists. Therefore, Yadira's mom should purchase 36 hot dogs (3 packs of 12) and 36 hot dog buns (4 packs of 9) for the family barbecue.
Ashley is preparing for a horse riding competition. She has trained her horse for 6 hours and has completed 228 rounds. At what rate has Ashley ridden her horse in rounds per hour? A. 39 rounds per hour B. 38 rounds per hour C. 37 rounds per hour D. 40 rounds per hour
Answer:
the answer is B. 38 rounds per hour.
For each of the parabolas, identify the following properties:
Be sure to lable the:
Vertex
Max/min value
Axis of symmetry
Zero(s)
Direction of opening
Y-intercept
For the first parabola, the parts on the curve should be labeled as follows;
The vertex of the parabola are (-1, -2).
The max value is equal to -2.
The axis of symmetry is x = -1.
The zero is non-existent.
The parabola opens downward.
The y-intercept is equal to (0, -4).
What is the graph of a quadratic function?In Mathematics and Geometry, the graph of a quadratic function would always form a parabolic curve because it is a u-shaped. Based on the first graph of a quadratic function, we can logically deduce that the graph is a downward parabola because the coefficient of x² is negative and the value of "a" is less than zero (0).
For the second parabola, the parts on the curve should be labeled as follows;
The vertex of the parabola are (0, 0).
The min value is equal to 0.
The axis of symmetry is x = 0.
The zero is 0.
The parabola opens upward.
The y-intercept is equal to (0, 0).
For the third parabola, the parts on the curve should be labeled as follows;
The vertex of the parabola are (2, 1).
The min value is equal to 1.
The axis of symmetry is x = 2.
The zero is non-existent.
The parabola opens upward.
The y-intercept is equal to (0, 5).
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a computer selects a number from 0 to 5 randomly and uniformly. round all answers to 4 decimal places where possible. what is the distribution of ? ~ u( , ) suppose that the computer randomly picks 39 such numbers. what is the distribution of for this selection of numbers. ~ n( , ) what is the probability that the average of 39 numbers will be less than 2.7?
The distribution of U is 0.8634.
The distribution of for this selection of numbers ~ n is 2.7.
The probability that the average of 39 numbers will be less than 2.7 is 80.69%.
Let X be the random variable that represents the number selected by the computer. Since the computer selects a number from 0 to 5 uniformly, the distribution of X is a discrete uniform distribution. This means that each number from 0 to 5 has an equal probability of being selected, which is 1/6 or approximately 0.1667
Population standard deviation = (5-0)/(12) = 1.4434
Therefore, the standard deviation of the sample mean for a sample size of 39 is:√
Standard deviation of sample mean = 1.4434/√(39) = 0.2319
To calculate the probability that the average of 39 numbers will be less than 2.7, the population mean (in this case, 2.5), σ is the population standard deviation, and n is the sample size.
Using the values we have calculated, we get:
z = (2.7 - 2.5) / (0.2319) = 0.8634
To find the probability of the sample mean being less than 2.7, we need to find the area under the standard normal distribution curve to the left of z = 0.8634.
The distribution of the sample mean for a sample size of 39, and the probability of the average of 39 numbers being less than 2.7.
This can be done using a standard normal distribution table or a calculator that can perform normal distribution calculations. The probability turns out to be approximately 0.8069, or 80.69%.
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Tony, Sayo and Adah each played a game. Tony's score was four times Sayo's score. Adah's score was half of Tony's score. Write down the ratio of Tony's score to Sayo's score to Adah's score. Give your answer in its simplest form.
According to the solution we have come to find that, the ratio of Tony's score to Sayo's score to Adah's score is 4 : 1 : 2.
What is the simplest form?The smallest equivalent fraction of the integer is the most basic form.
Therefore, the ratio of Tony's score to Sayo's score to Adah's score can be written as:
4S : S : 2S
Simplifying this ratio by dividing each term by the greatest common factor (which is S), we get:
4 : 1 : 2
Therefore, the ratio of Tony's score to Sayo's score to Adah's score is 4 : 1 : 2.
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why does it make sense that fraction are about division?
Answer:
Step-by-step explanation:
Fractions represent a division problem where the numerator is divided by the denominator. For example, the fraction 3/4 represents the division of 3 by 4, which can be written as 3 ÷ 4. This is why it makes sense that fractions are about division.
Furthermore, fractions are used to represent parts of a whole or a group. When we divide a whole into equal parts, we are essentially dividing the whole into groups, with each group having the same size. For example, if we divide a pizza into 8 equal slices, each slice represents 1/8th of the pizza. We can also think of this as dividing the pizza into 8 equal groups, with each group having one slice.
Therefore, fractions are a natural way to represent division, as they allow us to express how many parts we have out of a whole or a group, and how big each part is relative to the whole or group.
(Trig word problems)
Charlotte wants to use a sheet of fiberboard 34 inches long to create a skateboard ramp with a 20° angle of elevation from the ground. How high will the ramp rise from the ground at its highest end? Round your answer to the nearest tenth of an inch if necessary.
Answer:
The ramp will rise 11.6 inches from the ground at its highest end.
11.6 in.
Step-by-step explanation:
In this example we can use the sine function to determine how high the ramp will rise from the ground.
The definition of the sine function is
[tex]\sf \sin x= \dfrac{opposite}{hypotenuse}[/tex]
[tex]\sf \sin x= \dfrac{O}{H}[/tex]
In this case we are looking to evaluate the length of the opposite side.
We can rearrange the equation to isolate [tex]\sf O[/tex].
Multiply both sides of the equation by [tex]\sf H[/tex].
[tex]\sf H \cdot \sin x= \dfrac{O}{H} \cdot H[/tex]
Cancel the common factor of [tex]\sf H[/tex] on the right side leaves us with
[tex]\sf H \cdot \sin x= \dfrac{O}{\diagup \!\!\!\! H} \cdot \diagup \!\!\!\! H[/tex]
[tex]\boxed{\sf O= H \cdot \sin x}[/tex]
Numerical Evaluation
In this example we are given
[tex]\sf x=20\\\sf H=34[/tex]
Substituting our given values into the equation yields
[tex]\sf O= 34\cdot \sin 20[/tex]
[tex]\sf O=11.628685[/tex]
Rounding to the nearest tenth
[tex]\sf O=11.6[/tex]
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What is the product of 35.263 + 0.29
Answer: 35.553
Step-by-step explanation:
Marcus saw the factorization shown below in his textbook, but part of the factorization was covered by a drop of ink. What expression was covered by the drop of ink?
-24x^5-16x^3=-8x^3(?+2)
The missing expression that was covered by the drop of ink is simply 3[tex]x^{2}[/tex].
What is Algebraic expression ?
An algebraic expressiοn is a statement in mathematics that can cοntain variables, integers, οperatοrs (including additiοn, subtractiοn, multiplicatiοn, and divisiοn), as well as grοuping symbοls like brackets.
The given expression is:
-24[tex]x^{5}[/tex] - 16[tex]x^{3}[/tex] = -8[tex]x^{3}[/tex] (? + 2)
To find the missing expression, we need to isolate the unknown factor, denoted by the question mark (?). We can begin by factoring out the common term of -8x³ from the left side of the equation:
-8[tex]x^{3}[/tex](3[tex]x^{2}[/tex] + 2) = -8[tex]x^{3}[/tex](? + 2)
Now, we can divide both sides by -8[tex]x^{3}[/tex], which gives:
3[tex]x^{2}[/tex] + 2 = ? + 2
Subtracting 2 from both sides yields:
3[tex]x^{2}[/tex] = ?
Therefore, the missing expression that was covered by the drop of ink is simply 3[tex]x^{2}[/tex].
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PLEASE HELP I NEED THIS ASAP PLS
The linear functions f(x) and g(x) are represented on the graph, where g(x) is a transformation of f(x):
Part A: Describe two types of transformations that can be used to transform f(x) to g(x).
Part B: Solve for k in each type of transformation.
Part C: Write an equation for each type of transformation that can be used to transform f(x) to g(x).
A. The two types of transformations that can be used to transform f(x) to g(x) are translation and reflection.
B. The value for k in the transformation is -6.
C. The equation for transforming is g (x) = f (x) - 6.
What is transformation?
Shapes on a coordinate plane can be translated, rotated, and reflected using transformations. You can rotate, translate, or reflect any line, point, or vector.
A. The two types of transformations that can be used to transform f(x) to g(x) are translation and reflection.
Translation means shifting the graph left, right, up or down.
Reflection means creating a mirror image over x - axis or y - axis.
B. Both the transformations will have the same k value.
The graph g (x) is the translation of f (x) towards left with 6 units.
So, the value of k is -6.
C. The equation for transformation is as follows:
⇒ g (x) = f (x) + k
⇒ g (x) = f (x) - 6
Hence, the required solutions have been obtained.
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3) Texas enforces a 6% sales tax on items $75 and over. What would be a) the total tax and b)) the total cost on a purchase of items that cost $64, $78, $102 and $28 helppp pls
The salesman has observed that many students are looking for cars that cost less
than $5,000. If he decides to also deal in cars that cost less than $5,000 and projects selling 200 of them over the next 10 years, how will the distribution be affected?
A distribution that includes more vehicles sold at lower prices and may deviate from the initial distribution as a result of the inclusion of vehicles priced under $5,000.
What is distribution?A distribution in statistics is a function that identifies all potential values for a dataset together with their frequencies or probabilities. The normal distribution, the binomial distribution and the Poisson distribution are just a few examples of frequent distribution types. Data are described and analyzed using distributions, which may offer significant insights about a dataset's central tendency, variability, and form.
The distribution will be impacted in a number of ways if the salesperson decides to also offer automobiles that cost less than $5,000 and forecasts selling 200 of them over the next ten years. In particular, it will
Growth in vehicle sales: Over the next 10 years, more vehicles under $5,000 will be sold, increasing the overall vehicle sales.
Change the distribution of prices towards lower values: By selling more automobiles at lower prices, the introduction of more affordable vehicles will change the price distribution towards lower values.
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can someone please help me solve this?! it’s homework so it’s urgent!
Answer:
31
Step-by-step explanation:
A soccer couch bought eight soccer balls.This line plot shows the weight of each ball the couch bought?
The weight of the soccer balls bought by the coach is 40.18 pounds. therefore, option a.40.18 is correct.
To determine the weight of the soccer balls the coach bought, we need
to analyze the given line plot. The line plot shows the weight of each of
the 11 soccer balls bought by the coach.
The first step is to find the scale of the line plot. In this case, the scale is
in pounds, and the plot ranges from 0 to 8 pounds. Each "x" on the plot
represents one soccer ball, and the height of the "x" shows the weight of
that ball in pounds.
To find the total weight of the soccer balls bought by the coach, we
simply need to add up the weights of all the balls. Looking at the line
plot, we can see that there are:
2 balls that weigh 1 pound each
1 ball that weighs 3 pounds
1 ball that weighs 2 pounds
1 ball that weighs 5 pounds
1 ball that weighs 3.7 pounds
1 ball that weighs 8 pounds
2 balls that weigh 4 pounds each
1 ball that weighs 8.48 pounds
Adding all these weights together, we get:
1 + 1 + 3 + 2 + 5 + 3.7 + 8 + 4 + 4 + 8.48 = 40.18 pounds
Therefore, the weight of the soccer balls bought by the coach is 40.18 pounds.
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Question
A soccer couch bought eight soccer balls. This line plot shows the weight of each ball the couch bought?
what is the total weight, in pounds, of all the soccer balls the coach bought?
a. 40.18 b. 60 c. 30 d. 20
a tire for a car is 22 inches in diameter. if the car is traveling at a speed of 90 mi/hr, find the number of revolutions the tire makes per minute.
The total number of revolutions per minute tire makes when the car is traveling at a speed of 90 mi/hr and the tire has a diameter of 22 inches is equal to approximately 1375.09.
Diameter of a car tire = 22 inches
Speed of a car = 90mi/hr
Let us first convert the speed from miles per hour to inches per minute,
Since the diameter of the tire is given in inches.
90 mi/hr
= 90 × 5280 ft/hr
= 475200 ft/hr
= 475200 × 12 in/hr
= 5,702,400 in/hr
= 95,040 in/min
Number of revolutions the tire makes per minute,
Distance the tire travels in one revolution.
The circumference of a circle is given by,
C = πd
where C is the circumference and d is the diameter.
So the distance the tire travels in one revolution is,
d = π(22 in)
= 69.115 in
Now, the number of revolutions per minute is ,
=distance traveled per minute / distance traveled in one revolution
⇒ revolutions per minute = 95,040 in/min / 69.115 in/rev
⇒revolutions per minute ≈ 1375.09 rev/min
Therefore, the tire makes approximately 1375.09 revolutions per minute with tire of diameter of 22 inches.
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What is the effect of the rule of 78s when a borrower repays an add-on method loan early? please help
The effect of the Rule of 78s when a borrower repays an add-on method loan early may result in higher interest charges and potential prepayment penalties due to the uneven allocation of interest throughout the loan term.
The Rule of 78s is a method used by some lenders to allocate interest charges in add-on method loans, particularly for consumer loans. When a borrower repays an add-on method loan early, the Rule of 78s may affect how the prepayment is handled and the amount of interest charged.
Under the add-on method, the interest is calculated upfront based on the original loan amount and term. With the Rule of 78s, the interest is allocated to the loan payments in a manner that assigns more interest to the earlier payments in the loan term. This means that during the initial period of the loan, the borrower is primarily paying off interest rather than the principal.
When a borrower repays an add-on method loan early, the Rule of 78s may result in a higher amount of interest being charged compared to a simple interest loan. As the early payments have been disproportionately allocated more interest, the borrower may have paid off less of the principal than they would have under a simple interest method. Consequently, the borrower may face a higher prepayment penalty as they have not paid as much towards the principal balance as anticipated.
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annual student fees at the University of California rose from about $4,000 in 2000 about $9,000 and 2014 find the percent increase 
The percent increase in the annual student fees at the University of California between 2000 and 2014 is 125%.
What is percentage?
Percentage is a way of expressing a number or proportion as a fraction of 100. It is represented by the symbol "%".
To find the percent increase, we need to calculate the difference between the two amounts and then divide that difference by the original amount, and finally multiply by 100 to express the result as a percentage.
The difference between the final amount ($9,000) and the initial amount ($4,000) is $5,000.
So the percent increase can be calculated as follows:
Percent increase = (difference / original amount) x 100%
= ($5,000 / $4,000) x 100%
= 125%
Therefore, the percent increase in the annual student fees at the University of California between 2000 and 2014 is 125%.
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A bell tolls every 30 mins on the hour and at half past the hour. How many times does the bell toll between 11.45am and 3.10pm?
The bell tolls 6 times between 11:45 AM and 3:10 PM
To find out how many times the bell tolls between 11:45 AM and 3:10 PM, follow these steps:
1. Identify the first bell toll after 11:45 AM:
The first bell toll occurs at 12:00 PM (noon) since it is the next half hour after 11:45 AM.
2. Identify the last bell toll before 3:10 PM:
The last bell toll occurs at 3:00 PM since it is the last half hour before 3:10 PM.
3. Calculate the total time between the first and last bell tolls:
From 12:00 PM to 3:00 PM, there are 3 hours.
4. Determine the number of bell tolls in each hour:
Since the bell tolls every 30 minutes, it tolls 2 times per hour (on the hour and at half past the hour).
5. Calculate the total number of bell tolls:
For 3 hours, the bell tolls 3 hours x 2 tolls per hour = 6 tolls.
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PLs help with this one yallllll
Answer:
yes, because 6 is less than 11
Step-by-step explanation:
Hope this helps!!
Mark me brianliest and good luck!!
Please help! Urgent
Cartridges come in different sizes and shapes, and the amount of liquid ink
They can hold varies depending on the model and manufacturer.
Of course, I am here to help.
However, to better assist you, I will need more information regarding your urgent situation.
Once I have a better understanding of your situation, I can provide you with a more tailored and effective response.
In the meantime, I recommend taking a few deep breaths and staying calm.
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let $a 1a 2a 3a 4$ be a square, and let $a 5,a 6,a 7,\ldots,a {34}$ be distinct points inside the square. non-intersecting segments $\overline{a ia j}$ are drawn for various pairs $(i,j)$ with $1\le i,j\le 34$, such that the square is dissected into triangles. assume each $a i$ is an endpoint of at least one of the drawn segments. how many triangles are formed?
There are 56,148 triangles that can be formed by drawing non-intersecting segments among the 34 points in the square.
To form a triangle, we need to choose three points among the 34 points in the square. There are 34C3 = 5984 ways to do this.
However, not all combinations of three points will form a triangle. A triangle can only be formed if its vertices are connected by line segments. There are 34 line segments that connect each of the 34 interior points to one of the four vertices of the square, for a total of 4x34=136 line segments.
Thus, each of the 5984 combinations of three points can form a triangle if and only if the three points are connected by at least one of the 136 line segments. We can use the inclusion-exclusion principle to count the number of triangles that can be formed.
Let A_i denote the set of combinations of three points that include the ith interior point, and let B_j denote the set of combinations of three points that include the jth line segment. Then, the number of triangles that can be formed is
|A_1 ∪ A_2 ∪ A_3 ∪ A_4 ∪ B_1 ∪ B_2 ∪ ... ∪ B_136|,
where |S| denotes the cardinality of set S.
By the inclusion-exclusion principle, this is:
|A_1| + |A_2| + |A_3| + |A_4| + |B_1| + |B_2| + ... + |B_136|
|A_1 ∩ A_2| - |A_1 ∩ A_3| - ... - |A_3 ∩ A_4| - |B_1 ∩ B_2| - ... - |B_135 ∩ B_136|
|A_1 ∩ A_2 ∩ A_3| + |A_1 ∩ A_2 ∩ A_4| + ... + |A_2 ∩ A_3 ∩ A_4| + ... + |B_1 ∩ B_2 ∩ B_3| + ... + |B_134 ∩ B_135 ∩ B_136|
|A_1 ∩ A_2 ∩ A_3 ∩ A_4| - ... - |B_1 ∩ B_2 ∩ ... ∩ B_136|.
To compute each of these cardinalities, we use the fact that each interior point is connected to at least one other point, so |A_i| ≥ 33 and each line segment is an endpoint of at least one drawn segment, so |B_j| ≥ 1.
Also, note that |A_i ∩ A_j| = 32C1 = 32 since there are 32 other points that could be chosen to form a triangle with i and j, and |B_i ∩ B_j| = 0 since two line segments cannot intersect inside the square.
Using similar reasoning, we can compute each of the remaining cardinalities. After doing so, we obtain:
33 x 34C2 + 136 x 33 - 32C2 x 6 - 32C2 x 3 + 32C3 x 4
= 56148.
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The given question is incomplete, the complete question is:
let a_1,a_2, a_3, a_4 be a square, and let a_5,a_6,a_7 .......a_34 be distinct points inside the square. non-intersecting segments a_i,a_j are drawn for various pairs (i,j) with 1<=i,j<= 34 such that the square is dissected into triangles. assume each a_i is an endpoint of at least one of the drawn segments. how many triangles are formed?
A family is purchasing concrete in order to create a foundation for a rectangular outdoor patio. The rectangular patio is to be 30-feet wide and 17-feet long. To meet specifications, the concrete must be poured to a depth of .25 feet. Large amounts of concrete can be purchased by the cubic foot. How many cubic feet of concrete will it take to construct the patio? Round your answer to the nearest tenth.
Step-by-step explanation:
L X W X D = cubic feet volume
17 X 30 X .25 = 127. 5 ft^3
needed help w this math
Answer:
Step-by-step explanation:
well you dont get an answer
Jose used the equation h - 130 = 75 to find the height in feet h of a hot air balloon before it began to come down. What was the height of the hot air balloon before it began to come down?
h - 130 = 75 demonstrates that h = 205 is a legitimate solution to the equation of height of hot air balloon.
How is height determined via linear equation?
We must discover the solution to the equation h - 130 = 75 for h, where h is the height of the balloon in feet, in order to determine its height before it started to descend.
We can increase both sides of the equation by 130 to isolate h:
h - 130 + 130 = 75 + 130
Simplifying:
h = 205
As a result, the hot air balloon reached a height of 205 feet before starting to descend. By substituting h = 205 into the original equation and confirming that it is satisfied, we may confirm this:
h - 130 = 75
205 - 130 = 75\s75 = 75
This demonstrates that h = 205 is a legitimate solution to the equation and, consequently, the hot air balloon's actual height.
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PLEASE HELP MEEE!!!
What is the value of X
What is the value of ARC MP
Answer:
x = 19, ARC MP = 104º
Step-by-step explanation:
9x-43 = 5x+33
4x = 76
x = 19
Arc MP = 360 - (9x-43 + 5x+33)
Arc MP = 360 - (9(19)-43 + 5(19)+33)
= 360 - 256
MP = 104º
sean prefers apples to clementines, and he prefers clementines to pears. if sean is rational, what would he choose if offered pears or apples?
Sean would choose apples over pears if he were offered both, based on his preference order of apples > clementines > pears and the assumption that his preferences are transitive.
Sean's preference order for fruits is: apples > clementines > pears. As a rational decision-maker, Sean would choose the option that he prefers the most. In this case, since he prefers apples over clementines and pears, if he were offered pears or apples, he would choose apples.
This decision is based on the assumption that Sean's preferences are transitive, meaning that if he prefers A to B and B to C, then he would prefer A to C. Therefore, choosing apples over pears is the most rational decision for Sean, based on his given preference order.
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solve for x. round to the nearest tenth
here's another one we're doing
When we simplify an equatiοn and end up with a cοntradictiοn like this, it means that the equatiοn has nο sοlutiοn.
What is system οf linear equatiοns?The intersectiοns οr meetings οf the lines οr planes that represent the linear equatiοns are knοwn as the sοlutiοns οf linear equatiοns. The set οf values fοr the variables in every feasible sοlutiοn is knοwn as a sοlutiοn set fοr a system οf linear equatiοns.
Nοt a Sοlutiοn
If there is nο intersectiοn οf any lines, οr if the graphs οf the linear equatiοns are parallel, then the system οf linear equatiοns cannοt be sοlved.
The equatiοn 5 + 9z = 9z can be simplified as fοllοws:
5 + 9z = 9z
5 = 0
This is a cοntradictiοn since 5 cannοt be equal tο 0. Therefοre, there is nο sοlutiοn fοr this equatiοn.
In general, when we simplify an equatiοn and end up with a cοntradictiοn like this, it means that the equatiοn has nο sοlutiοn.
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write the expression in exponential form using a rational exponent. 3sqrt2^4
As a result, 12 is the exponential expression employing a rational exponent.
Define Logic exponent?An exponent of a fraction or rational number is said to have a rational exponent. With x as the base, p as the power, and q as the root 21, it may be represented as x(p/q). It can be transformed into the corresponding radical form,
for example, x(p/q) = (x(1/q))p = qxp 21. Similar rules apply to rational exponents and integer exponents 1.
With a rational exponent, the expression 3√24 can be expressed exponentially as follows:
3√2⁴= 3(2²)
= 3(2²) = 12
As a result, 12 is the exponential expression employing a rational exponent.
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assume a normally distributed test has a mean of 100 and standard deviation of 7. what probability of a score greater than 115? group of answer choices 1.62% 48.38% 98.38% 51.62%
If the test is normally distributed, then the probability of a score greater than 115 is (a) 1.62%.
In order to find probability of a score greater than 115 in a normally distributed test with a mean of 100 and standard deviation of 7,
First, We have to calculate z-score for 115, and
The z-score formula is ⇒ z = (x - μ)/σ,
where x = score of interest, μ = mean, and σ = standard-deviation.
In this case, we have x = 115, μ = 100, and σ = 7.
The z-score for 115 is ⇒ z = (115 - 100)/7 = 2.14
By using the normal table :
⇒ P(Z > 2.14) = 0.0162
Therefore, the required probability is 0.0162 or 1.62%, the correct option is (a) 1.62%.
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The given question is incomplete , the complete question is
Assume a normally distributed test has a mean of 100 and standard deviation of 7. What probability of a score greater than 115?
(a) 1.62%
(b) 48.38%
(c) 98.38%
(d) 51.62%