first we have to calculate expected return of each stocks
expected return =
from the above table Expected return of large company(l') = 5.5%
small company(s') = 21%
now we have to calculate standard deviation for each stock:
Standard deviation =
where p = probability
x = return with respect to probability
x' = expected return
standard deviation of large company = (12.25)^1/2 = 3.5%
standard deviation of small company = (49)^1/2 = 7%
difference = 7 - 3.5 = 3.5%
so standard deviation of small company stocks larger by 3.5%
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