A stock had returns of 14.99 percent, 19.71 percent, −18.07 percent, 12.67 percent, and 27.75 percent for the past five years. What is the variance of the returns?
Average return=Total return/Total time period
=(14.99+19.71-18.07+12.67+27.75)/5
=11.41%
Return | (Return-Average return)^2 |
14.99 | (14.99-11.41)^2=12.8164 |
19.71 | (19.71-11.41)^2=68.89 |
-18.07 | (-18.07-11.41)^2=869.0704 |
12.67 | (12.67-11.41)^2=1.5876 |
27.75 | (27.75-11.41)^2=266.9956 |
Total=1219.36% |
Standard deviation=[Total (Return-Average return)^2/(Time period-1)]^(1/2
=[1219.36/(5-1)]^(1/2)
=[1219.36/4]^(1/2)
=17.46%(Approx).
Variance=Standard deviation^2
=304.84%
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