The following table shows the probability distribution for a discrete random variable. X 12 15 17 20 22 24 25 30 P (X) 0.07 0.21 0.17 0.25 0.05 0.04 0.13 0.08 What is the mean of this discrete random variable? (That is, what is E (X), the expected value of X?) A. 20 B. 19.59 C. 20.625 D. 21
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