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jonny [76]
3 years ago
7

A package of AA batteries cost 3.50 plus an additional 6% tax. What is the price after tax?

Mathematics
2 answers:
Pavlova-9 [17]3 years ago
8 0
He answer would be $3.71
weqwewe [10]3 years ago
3 0
The batteries cost 3.50. We want to find out how much they cost after a 6 percent sales tax. 

First take the percentage and change it into decimal form, then multiply with the original number like I've done below. 

3.50 * 0.06 = 0.21 

3.50 + 0.21 = 3.71

Then you simply add the amount to the original 3.50 to get $3.71 as your price after sales tax. 
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Answer with explanation:

To test the Significance of the population which is Normally Distributed we will use the following Formula Called Z test

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\Bar X =31.1\\\\ \sigma=6.3\\\\ \mu=25\\\\n=15\\\\z=\frac{31.1-25}{\frac{6.3}{\sqrt{15}}}\\\\z=\frac{6.1\times\sqrt{15}}{6.3}\\\\z=\frac{6.1 \times 3.88}{6.3}\\\\z=3.756

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We will do Hypothesis testing to check whether population mean is different from 25 at the alpha equals 0.01 level of significance.

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With a z value of 3.75, it is only 3.75% chance that ,mean will be different from 25.

So,we conclude that results are not significant.So,at 0.01 level of significance population mean will not be different from 25.

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