Over the past five years, a stock produced returns of 11 percent, 14 percent, 4 percent, -9 percent, and 5 percent. What is the probability that an investor in this stock will not lose more than 10 percent in any one given year? |
- Greater than .5 but less than 1.0 percent. |
- Greater than 1 percent but less than 2.5 percent. |
- Greater than 2.5 percent but less than 16 percent. |
- Greater than 84 percent but less than 97.5 percent. |
- Greater than 95 percent. |
Average return =(0.11+0.14+0.04-0.09+0.05)/5 = 0.05 = 5%
Standard deviation of returns σ = √[1/(5 - 1)][(0.11 - 0.05)^2+ (0.14 -0 .05)^2+ (0.04 - 0.05)^2+ (-0.09 - 0.05)^2+ (0.05 - 0.05)^2] = 0.0886 = 8.86%
1) Stock will not lose more than 10 percent
z= (-0.1-0.05)/0.0886 = -1.6930
Hence,
Referring to the z-table, ( This is a one-tailed z-test)
z= -1.69 corresponds to Probability = 1-0.0455 = 0.9545
Hence, Greater than 84 percent but less than 97.5 percent ( while greater than 95 percent is also applicable, but 4th option is more suitable)
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