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FRM一级
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An analyst is studying a stock that is currently trading at $35. The analyst estimates that there is 33% probability that the stock will trade at $50 after one year, a 20% probability that the stock will trade at $42, and a 47% probability that the stock will trade at $20. What is the volatility of this stock return? A 15% B 26% C 36% D 39% 这道题可以用ln(y1/y2)来算收益么
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