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2 years ago

140 for 21 minutes how much for 18.minutes

Mathematics

1 answer:

statuscvo [17]2 years ago

3 0

In 18 minutes its 120 because you find the unit

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In order to estimate the difference between the average hourly wages of employees of two branches of a department store, the fol

Julli [10]

Answer:

$0.071,1.928$

Step-by-step explanation:

Downtown Store North Mall Store

Sample size n 25 20

Sample mean $\bar{x}$ $9 $8

Sample standard deviation s $2 $1

$n_1=25\\n_2=20$

$\bar{x_1}=9\\ \bar{x_2}=8$

$s_1=2\\s_2=1$

$x_1-x_2=9-8=1$

Standard error of difference of means = $\sqrt{\frac{s_1^2}{n_1}+\frac{s_2^2}{n_2}}$

Standard error of difference of means = $\sqrt{\frac{2^2}{25}+\frac{1^2}{20}}$

Standard error of difference of means = $0.458$

Degree of freedom = $\frac{\sqrt{(\frac{s_1^2}{n_1}+\frac{s_2^2}{n_2}})^2}{\frac{(\frac{s_1^2}{n_1})^2}{n_1-1}+\frac{(\frac{s_2^2}{n_2})^2}{n_2-1}}$

Degree of freedom = $\frac{\sqrt{(\frac{2^2}{25}+\frac{1^2}{20}})^2}{\frac{(\frac{2^2}{25})^2}{25-1}+\frac{(\frac{1^2}{20})^2}{20-1}}$

Degree of freedom =36

So, z value at 95% confidence interval and 36 degree of freedom = 2.0280

Confidence interval = $(x_1-x_2)-z \times SE(x_1-x_2),(x_1-x_2)+z \times SE(x_1-x_2)$

Confidence interval = $1-(2.0280)\times 0.458,1+(2.0280)\times 0.458$

Confidence interval = $0.071,1.928$

Hence Option A is true

Confidence interval is $0.071,1.928$

4 0

3 years ago

A juice factory offers its juice in both bottles and cans. A class of students on a field trip decides to compare the numbers of

Verizon [17]

Answer: 50 cases per minute

Step-by-step explanation:

1. Select one of the points on the graph. Let's use (2, 100) in this case.

2. Divide the number of cases (y) by the amount of minutes (x) This means the equation would be 100 ÷ 2.

3. Since 100 cases ÷ 2 minutes = 50 cases per minute, that means that is unit rate, which can be expressed by y = 50x or f(x) = 50x.

7 0

2 years ago

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I need help with this and explain how to do it please!!<br> 6x - 4z

Troyanec [42]

Answer:

you should know you dont need help so do it by yourself. if you want the awnser you should know or you just dont pay attention in class.1234567890 is your awnser

4 0

3 years ago

The Maria Island breeding program started in 2012, when Devil Ark released 15 devils. About 13% of them have died. How many is t

Marat540 [252]

The answer is: "about 2" .
___________________________________________

13% of 15 is _?_<span>_ ?
</span>
13% = 13/100 = 0.13

15 * 0.13 = 1.95 ; so about 2 animals (devils, in this case).
___________________________________________

7 0

2 years ago

Plz help me, I need answer

Shkiper50 [21]

Answer:

p=119

Step-by-step explanation:

A triangle has a total degree of 180. If you have two given points, add them together. In this case, those two points are equal to 61. Then, because one triangle is 180 degrees, subtract 61 from 180. You are left with 119 and that is your answer. Hope this helps :)

6 0

2 years ago

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