Average Return = (0.1 + 0.2 - 0.1 - 0.1) /4
= 0.025
Std Dev = {(R1 - Average)^2 + (R2 - Average)^2 + (R3 - Average)^2 + (R4 - Average)^2 }/'(sample size -1)
= { (0.1 - 0.025)^2 + (0.2 - 0.025)^2 + (-0.1 - 0.025)^2 + (-0.1 - 0.025)^2 } /(4-1)
= 0.15 = 15% Answer
The option C is correct.
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