Compute for the standard deviation of the following stocks and the PSEi.

AC JGS Year Stock Return x; X (X-X) Year Return x; x (x:-X)2 Stock Price Price 30/1/2014 524.00 30/1/2014 39.400 28/2/2014 575.50 28/2/2014 46.900 31/3/2014 578.00 31/3/2014 49.500 30/4/2014 624.00 30/4/2014 50.600 30/5/2014 618.00 30/5/2014 49.300 30/6/2014 647.50 30/6/2014 51.250 31/7/2014 658.00 31/7/2014 53.000 29/8/2014 700.50 29/8/2014 51.450 30/9/2014 740.00 30/9/2014 57.900 31/10/2014 690.00 31/10/2014 63.800 28/11/2014 694.00 28/11/2014 61.650 29/12/2014 694.00 29/12/2014 66.000 o o