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A particular stock is currently trading at $1. An expert market analyst determines that in one year the price of the stock will double with

A particular stock is currently trading at $1. An expert market analyst determines that in one year the price of the stock will double with a probability of 0.1, triple with a probability of 0.2, and be worth nothing with a probability of 0.7.

I.If the random variable X represents the gain or loss in the stock price in one year, what is the Variance of X?

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