Question: A discrete random variable takes the values -22, 3, 19, and 23 with probabilities 0.3, 0.2, 0.1, and 0.4 respectively. (a) What is the expectation

A discrete random variable takes the values -22, 3, 19, and 23 with probabilities 0.3, 0.2, 0.1, and 0.4 respectively.
(a) What is the expectation of the random variable?
(b) What is the standard deviation of the random variable?

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