mean = (sum of returns)/n
= (0.0425 + 0.0413 - 0.0205 + 0.0325 + 0.0725)/5
= 0.03366
variance = sum of (X-mean)^2/(n-1)
= [(0.0425-0.03366)^2 + (0.0413-0.03366)^2 + (-0.0205-0.03366)^2 + (0.0325-0.03366)^2 + (0.0725-0.03366)^2]/4
= 0.001144928
standard deviation = sqrt(0.001144928)
= 3.38%
The standard deviation of the past five monthly returns for K and Company are 4.25 percent,...
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