Suppose you have a stock portfolio where 28% of the stocks earned a return of 12.2%, 12% earned a return of 15.1%, 24% of the stocks earned a return of 0%, 18% of the stocks earned a return of -1.5%, and 18% of the firms earned a return of -3%.
(A) What is the average return?
(B) What is the variance of the returns?
(C) What is the standard deviation of the returns?