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Angelina_Jolie [31]

3 years ago

15

Avery gets new letters by email . He gets one for sports every 5 days , one for model railroads every 10 days and one for music

every 8 days if he got All 3 today how many more days will it be until he gets all three newsletters on the same day again

1 answer:

AnnZ [28]3 years ago

3 0

40 days until he gets all emails on the same day.

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The equation of (0, 3 (4, 2)

marusya05 [52]

Answer:

4x+y=12

Step-by-step explanation:

its the only one that is positive

and this is guess so don’t hate me if its wrong

hope this is right

5 0

3 years ago

The USA Today reports that the average expenditure on Valentine's Day is $100.89. Do male and female consumers differ in the amo

Aloiza [94]

Answer:

$a)\ \ \bar x_m-\bar x_f=67.03\\\\b)\ \ E=15.7416\\\\c)\ \ CI=[51.2884, \ 82.7716]$

Step-by-step explanation:

a. -Given that:

$n_m=41\ , \ \sigma_m=33, \bar x_m=135.67\\\\n_f=37. \ \ ,\sigma_f=20, \ \ \bar x_f=68.64$

#The point estimator of the difference between the population mean expenditure for males and the population mean expenditure for females is calculated as:

$\bar x_m-\bar x_f\\\\\therefore \bigtriangleup\bar x=135.67-68.64\\\\=67.03$

Hence, the pointer is estimator 67.03

b. The standard error of the point estimator, $\bar x_m-\bar x_f$ is calculated by the following following:

$\sigma_{\bar x_m-\bar x_f}=\sqrt{\frac{\sigma_m^2}{n_m}+\frac{\sigma_f^2}{n_f}}$

-And the margin of error, E at a 99% confidence can be calculated as:

$E=z_{\alpha/2}\times \sigma_{\bar x_m-\bar x_f}\\\\\\=z_{0.005}\times\sqrt{\frac{\sigma_m^2}{n_m}+\frac{\sigma_f^2}{n_f}}\\\\\\=2.575\times \sqrt{\frac{33^2}{41}+\frac{20^2}{37}}\\\\\\=15.7416$

Hence, the margin of error is 15.7416

c. The estimator confidence interval is calculated using the following formula:

$\bar x_m-\bar x_f\ \pm z_{\alpha/2}\sqrt{\frac{\sigma_m^2}{n_m}+\frac{\sigma_f^2}{n_f}}$

#We substitute to solve for the confidence interval using the standard deviation and sample size values in a above:

$CI=\bar x_m-\bar x_f\ \pm z_{\alpha/2}\sqrt{\frac{\sigma_m^2}{n_m}+\frac{\sigma_f^2}{n_f}}\\\\=(135.67-68.64)\pm 15.7416\\\\=67.03\pm 15.7416\\\\=[51.2884, \ 82.7716]$

Hence, the 99% confidence interval is [51.2884,82.7716]

7 0

3 years ago

Jessica is walking home from a friend's house. After two minutes she is 1 mile from home. Twelve minutes after leaving, she is 0

777dan777 [17]

Step-by-step explanation:

In ten minutes she walked 1-0.5=0.5 miles.

60 minutes/10 minutes=6. So 0.5 miles ×6=3 miles per hour

8 0

3 years ago

Which of the following is closest to 1/2 + 1/3

andre [41]

Answer:

.83

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

I NEED HELP!!! has endpoints X(7, 10) and Y(5, –8). Find the coordinates of the midpoint of .

Firlakuza [10]

The formula of a midpoint between X and Y:

$M_{XY}\left(\dfrac{x_X+x_Y}{2},\ \dfrac{y_X+y_Y}{2}\right)$

We have the points X(7, 10) and Y(5, -8). Substitute:

$\dfrac{7+5}{2}=\dfrac{12}{2}=6\\\\\dfrac{10+(-8)}{2}=\dfrac{2}{2}=1$

<h3>Answer: (6, 1)</h3>

7 0

3 years ago