MY LAST QUESTION<br><br> help me pleaseee<br><br> thankss

The sales price of a single family house in Charlotte is normally distributed with mean $210,000 and standard deviation $35,000.

jarptica [38.1K]

Answer:

E(X ¯)=210,000.

Step-by-step explanation:

A sampling distribution for samples of size n=49 from a population with means μ=210,000 and standard deviation σ=35,000, has the following means anda standard deviation:

$\mu_s=\mu=210,000\\\\\sigma_s=\sigma/\sqrt{n}=35,000/\sqrt{49}=35,000/7=5,000$

If X ¯ is the mean sales price of the sample, it will have a mean value of E(X ¯)=210,000.

6 0

3 years ago

Y= -4x + 1 y= -2x - 3

AysviL [449]

Answer:

x = 2 , y = -7

Step-by-step explanation:

Solve the following system:

{y = 1 - 4 x | (equation 1)

{y = -2 x - 3 | (equation 2)

Express the system in standard form:

{4 x + y = 1 | (equation 1)

{2 x + y = -3 | (equation 2)

Subtract 1/2 × (equation 1) from equation 2:

{4 x + y = 1 | (equation 1)

{0 x+y/2 = -7/2 | (equation 2)

Multiply equation 2 by 2:

{4 x + y = 1 | (equation 1)

{0 x+y = -7 | (equation 2)

Subtract equation 2 from equation 1:

{4 x+0 y = 8 | (equation 1)

{0 x+y = -7 | (equation 2)

Divide equation 1 by 4:

{x+0 y = 2 | (equation 1)

{0 x+y = -7 | (equation 2)

Collect results:

Answer: {x = 2 , y = -7

8 0

3 years ago

A bag of chips states that it contains 24 oz of chips. A sample of 40 bags finds a mean of 23.7 and a standard deviation of 0.2.

PIT_PIT [208]

Answer:

a) Null hypothesis: $\mu \geq 24$

b) Alternative hypothesis: $\mu < 40$

c) $t=\frac{23.7-24}{\frac{0.2}{\sqrt{40}}}=-9.487$

d) $df=n-1=40-1=39$

$p_v =P(t_{39}$

e) Since the p value is almost 0 we have enough evidence to reject the null hypothesis at the significance level of 0.05

f) Since we reject the null hypothesis we have enough evidence to conclude the true mean is significantly less than 24 ounces

Step-by-step explanation:

Information provided

$\bar X=23.7$ represent the sample mean for the weigth in ounces

$s=0.2$ represent the standard deviation

$n=40$ sample size

$\mu_o =24$ represent the value to verify

$\alpha=0.05$ represent the significance level

t would represent the statistic

$p_v$ represent the p value

Part a

For this case the null hypothesis is:

Null hypothesis: $\mu \geq 24$

Part b

And the alternative would be given by the claim:

Alternative hypothesis: $\mu < 40$

Part c

We don't know the population deviation so then the statistic would be given by:

$t=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}}$ (1)

And replacing the data given we got:

$t=\frac{23.7-24}{\frac{0.2}{\sqrt{40}}}=-9.487$

Part d

The degrees of freedom are given by:

$df=n-1=40-1=39$

And the p value for this case would be:

$p_v =P(t_{39}$

Part e

Since the p value is almost 0 we have enough evidence to reject the null hypothesis at the significance level of 0.05

Part f

Since we reject the null hypothesis we have enough evidence to conclude the true mean is significantly less than 24 ounces

5 0

3 years ago

Rectangle STUV is shown on a coordinate plane. Rectangle STUV with vertices S at negative 7 comma 6, T at negative 2 comma 6, U

rusak2 [61]

The coordinate of the point T after the given transformations is; T''(-2, -4)

<h3>How to carry out Translation Transformations?</h3>

We are given the coordinates of the rectangle STUV as;

S(-7, 6)

T(-2, 6)

U(-2, 1)

V(-7, 1)

Now, we are told that all these coordinates are translated using the transformation rule; (x, y) → (x − 2, y − 4)

Thus, the new coordinates using this transformation rule are;

S'(-9, 2)

T'(-4, 2)

U'(-4, -3)

V'(-9, -3)

Now, we are told that these new points are rotated 90° counterclockwise and as such the new coordinates formed will follow the pattern (x, y) → (-y, x).

Thus, our final coordinates are;

S''(-2, -9)

T''(-2, -4)

U''(3, -4)

V''(3, -9)

Thus, the coordinate of the point T after the given transformations is; T''(-2, -4)

Read more about Translation Transformation at; brainly.com/question/4289712

#SPJ1

4 0

2 years ago

Read 2 more answers

Suppose a teacher finds that the

horsena [70]

Answer:

Scores = 8

Step-by-step explanation:

To solve variation problems, you make mild assumptions and analogies

Let's score be represented with S

Let's Absences be represented with A.

Therefore

S varies inversely as A

S ~ 1/A

S = K/A

The K represents a contant notation so that we can easily figure the variation problem.

When Absences were 2

Scores were 12

S = K/A

12 = K / 2

Cross Multiply.

K = 24.

It means that, S = 24 / A.

For a student with 3 absences, the score would be:

S = 24 / A

S = 24 / 3

S = 8

Math is fun!

5 0

4 years ago

MY LAST QUESTION help me pleaseee thankss