Consider a game of chance in which one may win 10 dollars, Ask an Expert

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Consider a game of chance in which one may win 10 dollars or lose 1, 2, 3, or 4 dollars; each possibility has probability 0.20. How many times can this game be played if there is to be a probability of at least 95 % that in the final outcome the average gain or loss per game will be between -2 and +2?

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