A mutual fund has five equally likely outcomes: 15%, -7%, 5%, 2%, and -1%. Calculate the standard deviation of the rate of return.
3.8%
9.2%
5.8%
7.3%
Probability of each=(1/5)=0.2
Expected return=Respective return*Respective Probability
=(0.2*15)+(0.2*-7)+(0.2*5)+(0.2*2)+(0.2*-1)=2.8%
Probability | Return | Probability*(Return-Expected Return)^2 |
0.2 | 15 | 0.2*(15-2.8)^2=29.768 |
0.2 | -7 | 0.2*(-7-2.8)^2=19.208 |
0.2 | 5 | 0.2*(5-2.8)^2=0.968 |
0.2 | 2 | 0.2*(2-2.8)^2=0.128 |
0.2 | -1 | 0.2*(-1-2.8)^2=2.888 |
Total=52.96% |
Standard deviation=[Total Probability*(Return-Expected Return)^2/Total probability]^(1/2)
=(52.96)^(1/2)
=7.3%(Approx).
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