helppp i got this and i need it rq

Answer:

d=9

Step-by-step explanation:

9x1

The estimated mean age, sample variance, and sample standard deviation for a prehistoric extended family group of 84 members in the southwestern United States are 14.5 years, 83.5 square years, and 9.1 years, respectively.

To estimate the mean age, we need to calculate the weighted average of each age group's midpoint using their respective frequencies.

The midpoint of the first class (1-10 years) is 5.5, the midpoint of the second class (11-20 years) is 15.5, the midpoint of the third class (21-30 years) is 25.5, and the midpoint of the fourth class (31 and over) is 35.5.

To calculate the weighted average, we multiply each midpoint by its respective frequency, sum these products, and divide by the total number of individuals:

x = [tex]\frac{5.5 x 35 + 15.5 x 22 + 25.5 x 20 + 35.5 x 7}{84}[/tex] = 14.5 years

Therefore, the estimated mean age for this community is 14.5 years.

To calculate the sample variance and sample standard deviation, we first need to calculate the deviation of each observation from the mean. Then, we square each deviation, sum these squared deviations, and divide by n - 1 to get the sample variance.

Using the formula:

s2 = [tex]\frac{\sum_{i=1}^{n}(x_i - \bar{x})^2}{n-1}[/tex]

sample variance as follows:

s2 = [tex]\frac{[(1-10-14.5)^2 \times 35 + (11-20-14.5)^2 \times 22 + (21-30-14.5)^2 \times 20 + (35.5-14.5)^2 \times 7]}{83}[/tex] = 83.5

Therefore, the estimated sample variance for this community is 83.5 square years.

Using the formula:

s = [tex]\sqrt{s2}[/tex]

The sample standard deviation can be calculated as follows:

s = [tex]\sqrt{83.5}[/tex] = 9.1 years

Therefore, the estimated sample standard deviation for this community is 9.1 years.

To learn more about standard deviation, visit:

https://brainly.com/question/30374079

#SPJ1

Answer: 15 IF X=5 // OR its 4x-5 IF youre looking for an equivalent answer

Answer:

To find the probability of numbers lying between 500 and 900 inclusive with exactly two consecutive figures that are identical, we can use the following steps: Step 1: Count the total number of three-digit numbers between 500 and 900 inclusive. There are 400 three-digit numbers between 500 and 900 inclusive. Step 2: Count the number of three-digit numbers between 500 and 900 that have exactly two consecutive figures that are identical. We can break this down into cases based on the middle digit of the three-digit number. Case 1: The middle digit is not 0 or 9. In this case, there are 8 possible digits that can be used for the middle digit (i.e., 1, 2, 3, 4, 5, 6, 7, or 8). For each possible middle digit, there are

As an introduction to probability, Probability is the measure of the likelihood of an event occurring, and it is used to analyze the chances of different outcomes in an experiment or situation.

What is an experiment?

A student can start by understanding the basic concepts and terminology used in probability. Some of the key concepts include:

Experiment: An experiment is any process that produces a set of outcomes.

Outcome: An outcome is the result of an experiment.

Sample Space: The sample space is the set of all possible outcomes of an experiment.

Event: An event is a subset of the sample space.

Probability: Probability is a measure of the likelihood of an event occurring.

Once the student understands these concepts, they can move on to learning about the different types of probability, such as classical probability, empirical probability, and subjective probability. They can also learn about the different methods of calculating probability, such as using the formula:

P(E) = number of favorable outcomes / total number of outcomes

where P(E) is the probability of an event E occurring.

The student can then apply these concepts and methods to solve simple probability problems, such as finding the probability of flipping a coin and getting heads, or rolling a die and getting an even number. They can also explore more complex probability problems, such as conditional probability and the multiplication rule.

Overall, learning about probability is an important part of understanding how to make decisions and analyze data in many fields, including science, finance, and engineering.

To know more about probability, visit:

https://brainly.com/question/30034780

#SPJ1

Complete question is: As an introduction to probability, a student should start by understanding the basic concepts of probability theory, such as the sample space, events, and probabilities.

Answer:

To determine the best course grade your friend can earn, we need to know how much the final exam is worth. Since the final counts for 30% of the course grade, the remaining 70% must be from the other work completed so far. Let's assume that there's only one final exam and that it's graded out of 100 points. If your friend's current average is 84%, then they have earned 84 points out of every 100 possible points so far. To find the best course grade your friend can earn, we can set up the following equation: 0.7(84) + 0.3(F) = G where F is the score your friend earns on the final exam, and G is the overall course grade. We can solve for G by plugging in F and simplifying the equation: 0.7(

Answer:

543.75

Step-by-step explanation:

As a result, none of the suggested solutions are the correct one. The doctor's total capital assets $761,743.

What are assets?

Assets are resources that belong to a person or a business, have value, and can be utilized to make money. Cash, investments, real estate, equipment, and inventory are a few examples of assets.

Assets are split into two groups in accounting: current assets and non-current assets. In contrast to non-current assets, which cannot be turned into cash in a year or less, current assets can be changed into cash in a year or less.

The capital assets of the doctor are:

- $589,674 for the home

- Work equipment owned: $51,797

- Vehicle Cost: $61,182

$59,090 was invested.

The value of all the capital assets owned by the doctor is:

$589,674 + $51,797 + $61,182 + $59,090

value of all the capital assets  = **$761,743

To know more about capital assets visit:

brainly.com/question/14288500

#SPJ1

Answer:Option (d)

Step-by-step explanation: D (9, 27)

Answer:(2I3O-9247)

Step-by-step explanation:

Using trigonometric equation, we can find that on January 25th, 218 days after June 21st, there will be 11 hours of sunlight.

The trigonometric equations can be linear, quadratic, or polynomial equations and are conceptually related to algebraic equations. Trigonometric equations substitute the Sin, Cos, and Tan trigonometric ratios for the variables found in a typical polynomial equation. Sinθ, Cosθ, or Tanθ are the trigonometric ratios that are employed in trigonometric equations.

The number of daily sunlight hours of a particular location is modelled by the trigonometric equation,

l(t) = 12 + 3.5sin (2/365t)

L(t) denotes the number of hours of sunlight in a day.

t is the number of days after June 21st.

In order to find the day during the first 365 where there are 11 hours of sunlight, we must know the value of "t" for which L(t) = 11 hours. The result of solving for t in the given equation with L(t)=10 is as follows:

l(t) = 12 + 3.5sin (2/365t)

11 = 12 + 3.5sin (2/365t)

11-12 = 3.5sin (2/365t)

-1 = 3.5sin (2/365t)

-1/3.5 = sin (2/365t)

-0.285 = sin (2/365t)

For the inverse function of y = sin x

sin ⁻¹(y) =x + 2n

Given that we must determine the day with 11 hours of sunlight in the first 365 days, we get the following results when we set n=0: t = -35.3521 or t =217.9422.

Now, t cannot be negative since we want to discover that the day after June 21st will have 10 hours of sunlight. therefore, ignoring t=-35.3521. We now have t=217.9422.

By rounding, we arrive at the necessary response, t=218.

So, it will have 11 sunlights on January 25th—218 days after June 21st.

To know more about trigonometric equation, visit:

brainly.com/question/27821667

#SPJ1

The time it would take to pay back the loan is 16 years.

When a loan earns a simple interest, it means that the interest that would be paid by the borrower grows as a linear function of the amount borrowed, interest rate and the duration of the loan.

Simple interest = loan amount x time x interest rate

Interest = amount repaid - loan value

$678,400 - $320,000 = $358,400

Duration of the loan = simple interest / (loan amount x interest rate)

$358,400 / (0.07 x 320,000) = 16 years

To learn more about simple interest, please check: https://brainly.com/question/27328409

#SPJ1

The volume of the clay brick is 2.25 cubic inches and the weight of the clay brick is 0.1575 pounds

The volume of the clay brick, we need to use the dimensions provided. The length of the brick is 1 inch and the width is 2 [tex]\frac{1}{4}[/tex] inches. We can assume the height of the brick is also 1 inch since it is not specified.

The formula for the volume of a rectangular object is

V = lwh

where V is the volume, l is the length, w is the width, and h is the height.

Using the given dimensions, we can calculate the volume of the brick:

V = (1 inch) x (2 [tex]\frac{1}{4}[/tex] inches) x (1 inch)

V = (1 inch) x (2.25 inches) x (1 inch)

V = 2.25 cubic inches

V = 2.25 inches³

Since the density of the clay is given as 0.07 pounds per cubic inch, we can find the weight of the brick using the formula:

Weight = Volume x Density

Weight = 2.25 inches³ x 0.07 pounds/inches³

Weight = 0.1575 pounds

To learn more about volume follow the link: https://brainly.com/question/1578538

#SPJ1

The probability that exactly 7 out of 10 people chosen at random favor the new building project is approximately 0.2010 or 20.10%.

To calculate the probability that exactly 7 out of 10 people chosen at random favor the new building project, we need to use the binomial probability formula, which is:

P(X = k) = [tex](n choose k) * p^k * (1-p)^(n-k)[/tex]

where:

n = 10 (the number of trials)

k = 7 (the number of successes we want to find)

p = 0.6 (the probability of success)

Using this formula, we can calculate the probability as:

P(X = 7) = (10 choose 7) * [tex]0.6^7 * (1-0.6)^(10-7)[/tex]

P(X = 7) = (10!/7!3!) * [tex]0.6^7 * 0.4^3[/tex]

P(X = 7) = 120 * 0.0279936 * 0.064

P(X = 7) = 0.2010 (rounded to four decimal places)

Therefore, around 0.2010 or 20.10% of people like the new building project, which is the probability that exactly 7 out of 10 randomly selected individuals will do so.

To learn more about probability please click on below link        

https://brainly.com/question/16484393

#SPJ1

The portfolio should be invested as follows:

Stock A: $120,000 (12%)

Stock B: $220,000 (22%)

Stock C: $342,857 (34%)

Risk-free asset: $319,149 (32%)

What is statistics?

Statistics is a branch of mathematics that deals with the collection, analysis, interpretation, presentation, and organization of numerical data.

To create a portfolio equally as risky as the market, we need to calculate the portfolio's beta, which is the weighted average of the betas of the individual assets in the portfolio.

The beta of the market is 1, so we need to find the weights of each asset in the portfolio that will result in a beta of 1.

Let wA, wB, and wC be the weights of stocks A, B, and C in the portfolio, respectively. Since we want the portfolio to be equally as risky as the market, we have the following equation:

wA * 1.00 + wB * 1.20 + wC * 1.40 = 1.00

We also know that the total investment is $1,000,000, so we have:

wA * $120,000 + wB * $220,000 + wC * X + (1 - wA - wB - wC) * Y = $1,000,000

where X is the investment in stock C, and Y is the investment in the risk-free asset.

We have two equations and two unknowns, so we can solve for wC and Y:

wC = (1.00 - wA * 1.00 - wB * 1.20) / 1.40

$1,000,000 = wA * $120,000 + wB * $220,000 + wC * X + (1 - wA - wB - wC) * Y

Substituting the first equation into the second equation, we get:

$1,000,000 = wA * $120,000 + wB * $220,000 + [(1.00 - wA * 1.00 - wB * 1.20) / 1.40] * X + [1 - wA - wB - (1.00 - wA * 1.00 - wB * 1.20) / 1.40] * Y

Simplifying and solving for Y, we get:

Y = $319,149

Substituting this value back into the second equation and solving for X, we get:

X = $342,857

Therefore, the portfolio should be invested as follows:

Stock A: $120,000 (12%)

Stock B: $220,000 (22%)

Stock C: $342,857 (34%)

Risk-free asset: $319,149 (32%)

To learn more about statistics from the given link:

https://brainly.com/question/28053564

#SPJ1

Answer:

About 71 percent of the Earth's surface is water-covered

and the rest of the percent is 29 percent

Step-by-step explanation:

Area of land: 148 326 000 km2 (57 268 900 square miles), this are 29% of the total surface of Planet Earth. Area of water: 361 740 000 km2 (139 668 500 square miles), this are 71% of the total surface of the Earth.

Step-by-step explanation & Answer

We know that

[tex]\frac{2}{3}[/tex] = Water covering earth

[tex]\frac{1}{3}[/tex] = Land covering earth

We know that there is more water than land.

We would need to find the percentage which is:

[tex]\frac{2}{3}[/tex] = ?%

?% = 66.6666667% Or roughly 67%

[tex]\frac{1}{3}[/tex] = ?%

?% = 33.33 or 33%

We can see 67% & 33% = 100%!

So the answer to you problem is,

Water covering earth: 67%

Land covering earth: 33%

Answer: two related quantities by comparing their ratios and establishing equivalence.

Step-by-step explanation: A proportion is a mathematical statement that equates two ratios.  It is commonly used to express the relationship between two related quantities or sets of data.  A proportion consists of four values: two ratios, where each ratio is made up of a numerator and a denominator.

Proportions are useful for comparing and understanding the relationship between different quantities.  They can be used to solve various real-life problems, such as determining equivalent values, finding unknown quantities, or making predictions based on known information.

For example, if a recipe calls for 2 cups of flour and 1 cup of water, the proportion would be 2:1. This proportion shows the relationship between the amount of flour and water needed in the recipe.

In a proportion, the ratios are equivalent, meaning they have the same value.  This equality allows us to solve for unknown quantities by cross-multiplying and finding the missing value.

Learn more about proportions here: https://brainly.com/question/34285561.

Answer:

5 boxes

Step-by-step explanation:

We Know

There are 40 apples packed into boxes.

There are 8 apples in each box

How many boxes are there?

We take

40 / 8 = 5 boxes

So, there are 5 boxes.

On solving the provided question we can say that As a result, the matrix following provides a foundation for V': { [1, 1, 0] }

A matrix is a collection of numbers that are organised in rows and columns. Learns about matrix elements and dimensions and introduces them for the first time. A matrix is a rectangular grid of numbers in rows and columns. Matrix A, for example, has two rows and three columns. Its name is derived from its single row and 1 n row matrix order. For example, A = [1 2 4 5] is a row matrix of order 1 by 4. Another example of a row matrix is P = [-4 -21 -17] of order 1-by-cubic.

To identify a basis for the R3 subspace V' spanned by the vector v = [1, 1, 0], we must first determine a set of linearly independent vectors that span V'.

One option is to row-reduce the augmented matrix [v|0] using the Gaussian elimination method, where 0 is the zero vector in R3.

[1 1 0 | 0]

[1 1 0 | 0]

[0 0 0 | 0]

This demonstrates that the vector v = [1, 1, 0] spans an R3 one-dimensional subspace, implying that any nonzero scalar multiple of v is also in V'.

As a result, a basis for V' is the set v, which consists solely of the vector v itself.

As a result, the following provides a foundation for V':

{ [1, 1, 0] }

To know more about matrix visit:

https://brainly.com/question/29995229

#SPJ1

The function (fog)(x) is 4x² - x - 3.

In mathematics, a function is a rule that maps each element from a set (called the domain) to a unique element in another set (called the range or codomain).

In other words, a function is a mathematical object that takes one or more inputs, performs a specified operation on them, and produces an output. The input values of a function are called its arguments, and the output value is called the function value.

Starting with g(x):

g(x) = -4x² + x + 5

Now substituting g(x) into f(x):

f(g(x)) = -(g(x)) + 2

= -[-4x² + x + 5] + 2 (substituting g(x) into f(x))

= 4x² - x - 3

Therefore, (fog)(x) = 4x² - x - 3.

To know more about range, visit:

https://brainly.com/question/29204101

#SPJ1

Answer:

add 2 or find following odd number

Step-by-step explanation:

+2 moves 13 to 15, 15 to 17, 17 to 19, ...

Therefore, an equivalent equation solved for V is:

V = m/d.

None of the options given in the question are equivalent to this equation.

In general, "volume" refers to the amount of space occupied by a three-dimensional object or substance. It can also refer to the amount or quantity of something, such as the volume of water in a swimming pool, the volume of air in a room, or the volume of a book.

In the context of mathematics, the term "volume" is often used to refer specifically to the measure of the amount of space enclosed by a solid object, typically measured in cubic units such as cubic meters (m³) or cubic feet (ft³). For example, the volume of a cube with sides of length 1 meter would be 1 cubic meter (1 m³).

To solve for V in terms of the given equation, we need to isolate V on one side of the equation.

Starting with d = m/V, we can rearrange the terms as follows:

[tex]d = m/V[/tex]

Multiplying both sides by V, we get:

[tex]dV = m[/tex]

Dividing both sides by d, we get:

[tex]V = m/d[/tex]

Therefore, an equivalent equation solved for V is:

[tex]V = m/d.[/tex]

None of the options given in the question are equivalent to this equation.

To know more about equivalent equation, visit:

https://brainly.com/question/29013156

#SPJ1

Answer:

x=25/2 or 12.5

Step-by-step explanation:

8x=115-15

8x=100

x=100/8

x=25/2 or 12.5

Answer:

x = 12.5

Step-by-step explanation:

4x + 14 + 4x = 38+77 - 1

8x + 14 = 38 + 77 - 1

8x + 14 = 114

8x = 100

x = 12.5

The number of pickups is 284.

and the number of cars is 142 more than that = 426.

What is arithmetic?

Arithmetic is an elementary part of mathematics that consists of the study of the properties of the traditional operations on numbers—addition, subtraction, multiplication, division, exponentiation, and extraction of roots.

Here, we have

Given: The ratio of pickups to cars sold at a dealership is 2 to 3. If the dealership sold 142 more cars than pickups in 1999

Let y = the number of cars.

x/y = 2/3.

The dealership sold 142 more cars than pickups.

We get y = x + 142

In the equation of x/y = 2/3, replace y with x + 142 to get:

x/(x+142) = 2/3

cross multiply to get:

3x = 2*(x+142)

simplify to get:

3x = 2x + 284

subtract 2x from both sides of the equation to get:

x = 284.

Hence,  the number of pickups is 284.

and the number of cars is 142 more than that = 426.

To learn more about the arithmetic from the given link

https://brainly.com/question/28369191

#SPJ1

Answer:

120 cups of lemonade

Step-by-step explanation:

1. Multiply 8 x 5 which will give you 40

2. Multiply 40 x 3 which equals 120

Margo will pay $21.28 in interest for the loan. The formula I = Prt is used to calculate the interest for a loan.

It is expressed as a percentage of the total amount borrowed and is typically noted as an annual percentage rate (APR).

The interest that Margo will pay can be calculated by using the formula I = Prt, where I is the interest, P is the principal (the initial amount borrowed), r is the interest rate, and t is the length of time.

In this case, the principal is $200, the interest rate is 8%, and the time is 16 months.

Therefore, the interest that Margo will pay is

I = 200 x 8% x (16/12)

 = $21.28

Therefore, Margo will pay $21.28 in interest for the loan.

The formula I = Prt is used to calculate the interest for a loan.

Here, I is the interest, P is the principal (the initial amount borrowed), r is the interest rate, and t is the length of time.

This formula can be used to calculate interest for any loan, no matter the principal, interest rate, or length of time.

By simply substituting the values into the formula, the interest can be easily calculated.

Therefore, in this case, Margo will pay $21.28 in interest for the loan.

For more questions related to principal

https://brainly.com/question/30985566

#SPJ1

About 2.28% of births would be expected to occur more than 22 days after the mean pregnancy length.

What is percentage?

Percentage is a way of expressing a number or proportion as a fraction of 100. It is represented by the symbol "%".

Since the lengths of pregnancy terms are nearly normally distributed with a mean pregnancy length and a standard deviation of 11 days, we can use the properties of the normal distribution to answer this question.

Let X be the length of pregnancy terms, then X ~ N(μ, σ) where μ is the mean pregnancy length and σ is the standard deviation.

We want to find P(X > μ + 22), which is the probability that a birth occurs more than 22 days after the mean pregnancy length.

Using the standard normal distribution, we can standardize X as follows:

Z = (X - μ) / σ

Since X ~ N(μ, σ), then Z ~ N(0, 1).

Therefore, P(X > μ + 22) = P(Z > (22/σ)) = P(Z > (22/11)) = P(Z > 2)

Using a standard normal distribution table or calculator, we can find that the probability of Z being greater than 2 is approximately 0.0228.

So, about 2.28% of births would be expected to occur more than 22 days after the mean pregnancy length.

To learn more about percentage from the given link:

https://brainly.com/question/29306119

#SPJ1

The function which is represented by graph is y= √(-x-2) + 1. So correct option is C.

In mathematics, a function is a relation between two sets of objects in which each element of the first set (called the domain) is associated with exactly one element of the second set (called the range). The domain and range can be any sets, but they are usually subsets of the real numbers.

A function is typically denoted by a name, such as f(x), and is defined by an equation or a rule that specifies how the function operates on its inputs. The inputs to the function are typically denoted by x, and the outputs are denoted by f(x).

Functions can be represented graphically as well. The graph of a function is a visual representation of the relation between the input and output values. It is a plot of the input values on the x-axis and the output values on the y-axis.

Functions can be classified in various ways, such as linear, quadratic, exponential, trigonometric, etc. The behavior of a function can also be analyzed by looking at its domain and range, its symmetry, its intercepts, and its slope.

The function which is represented by graph is y= √(-x-2) + 1. So correct option is C.

To know more about graph visit:

https://brainly.com/question/29163305

#SPJ1

Answer:

Prejudice and discrimination are related concepts that are often seen together in intergroup relations. Prejudice refers to preconceived opinions, attitudes, or beliefs about a group or individual based on their membership in a particular social group. Discrimination, on the other hand, refers to actions that are based on prejudice and that result in unequal treatment or opportunities for individuals or groups.

The relationship between prejudice and discrimination is that prejudice often leads to discrimination. When individuals or groups hold prejudiced beliefs about others, they are more likely to engage in discriminatory actions towards them. Discrimination can take many forms, including social exclusion, harassment, violence, and unequal access to resources and opportunities.

One way to combat both prejudice and discrimination is through education and awareness-raising campaigns. By educating individuals and communities about the harmful effects of prejudice and discrimination, people can learn to recognize their own biases and work to eliminate them. Other strategies include promoting diversity and inclusion in workplaces, schools, and other social settings, and providing equal opportunities for all individuals regardless of their background.

An example of intergroup relationships could be segregation and pluralism. Segregation refers to the physical separation of different groups within society, often based on factors such as race or ethnicity. An example of segregation is the historical segregation of African Americans in the United States, where they were denied access to many public spaces, such as schools and restaurants.

Pluralism, on the other hand, refers to the coexistence of different cultural and ethnic groups within society. In a pluralistic society, individuals and groups are free to express their cultural identities and customs without fear of discrimination or prejudice. An example of pluralism is Canada, which has a multicultural policy that recognizes and celebrates the diversity of its citizens while promoting equal opportunities and rights for all.