Thread: Question about sample variance formula

Hi,
I saw this formula when reading the Wikipedia article on Bessel's correction.


Can you please explain to me the steps that must be taken to come to the expression on the right?
Thank you very much.

You can start by expanding the brackets on the left and then splitting the sum into separate sums.

Post your results for those steps if you like.

which Variance formula on excel is the main one to use?





bar stool