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slavikrds [6]
3 years ago
9

Find the percent of change from $240 to $320

Mathematics
2 answers:
Svetlanka [38]3 years ago
6 0
320/240 = 1.33

1.33 = 133% (move the decimal point over two places to the right)

133% is your answer

hope this helps
pogonyaev3 years ago
4 0
Find the difference between $240 and $320.  It's $80.

Then the percentage change was

$80
-------- * 100% = +33.33%
$240
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Answer:

A sample of 179 is needed.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1 - 0.85}{2} = 0.075

Now, we have to find z in the Ztable as such z has a pvalue of 1 - \alpha.

That is z with a pvalue of 1 - 0.075 = 0.925, so Z = 1.44.

Now, find the margin of error M as such

M = z\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

A previous study found that for an average family the variance is 1.69 gallon?

This means that \sigma = \sqrt{1.69} = 1.3

If they are using a 85% level of confidence, how large of a sample is required to estimate the mean usage of water?

A sample of n is needed, and n is found for M = 0.14. So

M = z\frac{\sigma}{\sqrt{n}}

0.14 = 1.44\frac{1.3}{\sqrt{n}}

0.14\sqrt{n} = 1.44*1.3

\sqrt{n} = \frac{1.44*1.3}{0.14}

(\sqrt{n})^2 = (\frac{1.44*1.3}{0.14})^2

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Rounding up

A sample of 179 is needed.

7 0
3 years ago
What is the sum of 2 1/3, 3 5/6 and 6 2/3
Andreas93 [3]
2 1/3+ 3 5/6+ 6 2/3
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The final answer is 12 5/6~
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Step-by-step explanation:

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