Question

What is the standard deviation of {4, 6, 3, 7, 1, 3, 7, 8, 3, 6, 2, 5}?

Answer 1

First find the mean using the formula:
`m = x_1 + x_2 +x_3 +cdots + x_(n-1) + x_n`
which can be written as
`1/nsum_(i=1)^n x_i` where `x_i` is the ith entry of your data above.
For you case `n= 12; m = 1/12sum_(i=1)^12 x_i`
Now that you have the mean the standard deviation is:
`S = sqrt(1/12sum_(i=1)^12(x_i-m)^2`

I think you should practice in calculating the mean and standard deviation by finishing it yourself. Just plug the numbers.
Good luck!