help me in performing summation

I want to perform equation 7 and 8

http://imgur.com/HYau77G

please help me,

N is 256 and mew is 0.5

i tried symbolic summation but could not get answer

Answer 1

[Roger Stafford]

It is useless to attempt a symbolic summation of these quantities. Each of the x quantities would have to appear. Just use matlab numeric formulas:

 N = length(x);
 mu = sum(x)/N;
 sigmasquared = sum((x-mu).^2)/(N-1);