EXPECTED RETURN A stock's returns have the following distribution:

Expected Sales=Respective sales*Respective probability
=(0.2*24)+(0.2*12)+(0.4*16)+(0.1*22)+(0.1*70)=8.4%
probability  Return  probability*(ReturnExpected Return)^2 
0.2  24  0.2*(248.4)^2=209.952 
0.2  12  0.2*(128.4)^2=83.232 
0.4  16  0.4*(168.4)^2=23.104 
0.1  22  01*(228.4)^2=18.496 
0.1  70  0.1*(708.4)^2=379.456 
Total=714.24% 
Standard deviation=[Total probability*(ReturnExpected Return)^2/Total probability]^(1/2)
=26.73%(Approx).
Coefficient of variation=Standard deviation/Expected Return
=(26.73/8.4)=3.18(Approx).
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