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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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<u>Data Set 1</u>

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\sigma =\sqrt{\dfrac{(1-3)^2+(2-3)^2+(3-3)^2+(3-3)^2+(6-3)^2}{5}}\\=\sqrt{\dfrac{4+1+0+0+9}{5}}\\=\sqrt{\dfrac{14}{5}}\\\\=1.67

<u>Data Set 2</u>

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<u />\sigma =\sqrt{\dfrac{(2-3)^2+(2-3)^2+(3-3)^2+(3-3)^2+(4-3)^2+(4-3)^2}{6}}\\=\sqrt{\dfrac{1+1+0+0+1+1}{6}}\\=\sqrt{\dfrac{4}{5}}\\\\=0.89<u />

<u />

0.89 X 2=1.78 which is close to 1.67

Therefore, the standard deviation of Data Set 1 is about twice the standard deviation of Data Set 2.

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3 years ago
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