A stock had returns of 14.95 percent, 19.65 percent, −17.85 percent, 12.65 percent, and 27.58 percent for the past five years. What is the variance of the returns
Average return=Total return/Total time period
=(14.95+19.65-17.85+12.65+27.58)/5=11.396%
Return | (Return-Average return)^2 |
14.95 | (14.95-11.396)^2=12.630916 |
19.65 | (19.65-11.396)^2=68.128516 |
-17.85 | (-17.85-11.396)^2=855.328516 |
12.65 | (12.65-11.396)^2=1.572516 |
27.58 | (27.58-11.396)^2=261.921856 |
Total=1199.58232% |
Standard deviation=[Total (Return-Average return)^2/(Time period-1)]^(1/2)
=[1199.58232/(5-1)]^(1/2)
=[1199.58232/4]^(1/2)
=17.32%(Approx)
Variance=Standard deviation^2
=299.9%(or 0.02999 approx)
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