a. We should follow Sample Distribution.
b. Expt. Return= Rf+Beta(Rm-Rf)
For stock x
15%= Rf+1.5(Rm-Rf)
15%= Rf+1.5Rm-1.5Rf
15%= 1.5Rm-0.5Rf......(1)
For stock Y
10%= Rf+0.7(Rm-Rf)
10% = Rf+0.7Rm-0.7Rf
10% = 0.7Rm+0.3Rf........(2)
Multiply equation (1) by 3 and equation (2) by 5 and add (1) into (2)
50% = 3.5Rm+1.5Rf
45%= 4.5Rm-1.5Rf
95%= 8Rm
Rm= 11.875%.
Put Rm= 11.875% in equation (1)
15%= 1.5(11.875%)-0.5Rf
15%= 17.8125-0.5Rf
Rf = 5.625.
c.
Formulas used :-
Covariance=D25*D23*E23
Portfolio return=(0.5*$D$22)+(0.5*$E$22)
portfolio standard deviation=((0.5^2*$D$23^2)+(0.5^2*$E$23^2)+(2*$D$24*0.5*0.5))^(1/2)
d.
I hope my efforts will be fruitful to you....?
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