I am NOT trying to find the answer per say. I am trying to understand HOW to GET the answer. So, in week 3 of QNT561 there is the standard deviation...

I am NOT trying to find the answer per say. I am trying to understand HOW to GET the answer. So, in week 3 of QNT561 there is the standard deviation and the standard deviation is 52.20153254 according to the paper that I am looking at. However, I CANNOT figure out HOW to get that same number (or even close to that number). So, I am not sure WHAT I am doing wrong on this.