Question

What is the standard deviation of the following data set?

3, 6, 1, 9, 6

Answer 1

\[\textbf{STEP 1: FIND THE MEAN}\]Add all numbers and divide by five.

\[\textbf{STEP 2: FIND }\mathbf{(n - mean)^2}\]I.E., first find \((3 - mean)^2\) then \((6 - mean)^2\) and so on.
\[\textbf{STEP 3: FIND THE MEAN OF ALL THE (n - mean)}^2\]