Hi I am trying to calculated the standard deviation from the mean by *sigma 3. I am not very knowledgeable anyway on stats but the calculation below is giving me a figure but not the correct figure. just wondering if anything sticks out as being wrong in the expression.
Do you have a formula template that you are using?
It looks like you probably don't have all of the Parenthesis in the right places. if you have a template or something that that you can post that you are trying to follow, I might be able to give you a hand on this.