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3 years ago

What is 81 to the power of 0.5?

Mathematics

2 answers:

Anika [276]3 years ago

4 0

9

0.5 means you can write the problem out like this 1/(81)^(1/2)=1/9

meaning 1 part of 81 would be 9

9x9 = 81

Kisachek [45]3 years ago

3 0

It would be 40.5 or 40 1/2

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For the data set 6,5,10,11,13, the mean, x, is 9. What is the standard deviation?

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Step-by-step explanation:

We will use SD formula to find our answer.

$\sigma=\sqrt{ \frac{\sum (x-\overline{x})^{2}}{N-1} }$

$\sigma$ = Standard deviation.

$\overline{x}$ = Mean.

N= Numbers of data-points.

We have been given that mean of our data set is 9. So we will find the square of each data point's distance to the mean.

Now let us substitute our given values in above formula.

$\sigma=\sqrt{ \frac{(6-9)^{2}+(5-9)^{2}+(10-9)^{2}+(11-9)^{2}+(13-9)^{2}}{5-1} }$

$\sigma=\sqrt{ \frac{(-3)^{2}+(-4)^{2}+(1)^{2}+(2)^{2}+(4)^{2}}{4} }$

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