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Paha777 [63]
3 years ago
7

A book cost $9.60 after sales tax the book is $10.20 what is the sales tax rate

Mathematics
1 answer:
lesya [120]3 years ago
5 0
10.20 - 9.60 = .60
.60 % 9.60 = .0625
move the decimal 2 times to the right
so your answer is: 6.25%
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Answer:

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Step-by-step explanation:

We have to calculate the minimum sample size n needed to have a margin of error below 0.14.

The critical value of z for a 95% confidence interval is z=1.96.

To do that, we use the margin of error formula in function of n:

MOE=\dfrac{z\cdot \sigma}{\sqrt{n}}\\\\\\n=\left(\dfrac{z\cdot \sigma}{MOE}\right)^2=\left(\dfrac{1.96\cdot 1.7}{0.14}\right)^2=(23.8)^2=566.42\approx 567

The minimum sample size to have this margin of error is n = 567.

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