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almond37 [142]
2 years ago
5

REWARDING BRAINLY TO CORRECT ANSWER

Mathematics
2 answers:
Jlenok [28]2 years ago
5 0

Answer:

D

Step-by-step explanation:

Add them all then divide the amount of numbers added.

nadezda [96]2 years ago
4 0

Answer:

It’s 19

Step-by-step explanation:

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A random sample of 30 households was selected as part of a study on electricity usage, and the number of kilowatt-hours (kWh) wa
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Answer:

The 98% confidence interval for the mean usage in the March quarter of 2006, in kWh, was (333.87, 416.13).

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 30 - 1 = 29

98% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 29 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.98}{2} = 0.99. So we have T = 2.462

The margin of error is:

M = T\frac{s}{\sqrt{n}} = 2.462\frac{91.5}{\sqrt{30}} = 41.13

In which s is the standard deviation of the sample and n is the size of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 375 - 41.13 = 333.87 kWh

The upper end of the interval is the sample mean added to M. So it is 375 + 41.13 = 416.13 kWh

The 98% confidence interval for the mean usage in the March quarter of 2006, in kWh, was (333.87, 416.13).

6 0
3 years ago
 The largest exponent in a polynomial is called its _____.
Galina-37 [17]
This is called the leading term
8 0
3 years ago
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A bookstore had 60 copies of a magazine. Yesterday, it sold 1/4 of them. Today, it sold 2/5 of what remained. How many copies do
KatRina [158]
There would be 29 books left
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3 years ago
Three packages of pens and one box of paper cost $26. Two packages of pens and 7 boxes of paper cost $49. How much does one box
algol13

Answer:

5 dollars

Step-by-step explanation:

Let's call the price of a package of pens n, and the cost of a box of paper r.

3n+r=26

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21n+7r=182

Subtract the second equation from the first:

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Divide both sides by 19 to isolate n:

n=7

Plug this back in to find the value of a box of paper:

3(7)+r=26

21+r=26

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Hope this helps!

5 0
3 years ago
Rewrite 2+(1/b-2) = (3b/b+2) as a proportion. Which of these proportions is equivalent to the original equation?
lorasvet [3.4K]

Answer: c for the first part

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Step-by-step explanation:

all on edg

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3 years ago
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