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Question:

An analyst estimates a stock has a 40% probability of earning a 10% return, a 40% probability of earning a 12.5% return, and a 20% probability of earning a 30% return. The stock’s standard deviation of returns based on this returns model is closest to:

A 7.58%.
Explaination

Expected value = (0.4)(10%) + (0.4)(12.5%) + (0.2)(30%) = 15%
Variance = $3154_w470_h22.png$
Standard deviation = $8695_w116_h19.png$