Solution :- Returns = 13% , 9% , -12% , 10%
Average Return = ( 13% + 9% - 12% + 10% ) / 4 = 20% / 4 = 5%
Variance = D * D / ( n - 1 ) = 3.94% / ( 4 - 1 ) = 1.3133%
Standard Deviation = ( Var )1/2 = ( 1.3133% )1/2 = 11.46%
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