Question: 10. Suppose that 420 true dice are rolled simultaneously. (a) If X is a random variable denoting the total number of aces that turn up,

10. Suppose that 420 “true” dice are rolled simultaneously.

(a) If X is a random variable denoting the total number of aces that turn up, find the values of the mean and standard deviation of X.

(b) If Y is a random variable denoting the total number of dots that turn up, find the values of the mean and standard deviation of Y.

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