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SAT, 09.12.2021 03:40 lindsaynielsen13
Let x be a random variable whose values are the number of dots that appear on the uppermost face when a fair die is rolled. The possible values of x are 1, 2, 3, 4, 5, and 6. The mean of x is 7/2 and the variance of x is 35/12. Let y be a random variable whose value is the difference (first minus second) between the number of dots that appear on the uppermost face for the first and second rolls of a fair die that is rolled twice. What is the standard deviation of y?.
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