There are 84 players who play a chess game against the Computer. Each player plays 36 times and the probability that he/she wins is 0.55. Let Xi denote the number of times player i wins. What is the Standard Deviation of ? where ? is the sample average of a number of wins among 84 players

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Q: The probability that a patient recovers from a delicate heart operation is 0.85. What is the…

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A: