Question

the mean is 5.8the variance is 2.4We have to find the standard deviation and round it to one decimal place.

Answer 1

To calculate the standard deviation given the variance, we just take the square root.

That because the variance is:

`v=\sigma^2`

And the standard deviation is:

`\sigma`

So, calculating the standard deviation:

`\sigma=\sqrt[]{\sigma^2}=\sqrt[]{v}=\sqrt[]{2.4}=1.54919\ldots\approx1.5`

Thus, the standard deviation is 1.5.