Question: A certain random variable x takes the value of 9,2,1 and -2 with respective probabilities 0.1,0.2,0.3,0.4. Find the mean and the standard deviation of x.

A certain random variable x takes the value of 9,2,1 and -2 with respective probabilities 0.1,0.2,0.3,0.4. Find the mean and the standard deviation of x.

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