Question: Calculate the mean, µY, of the random variable Y from Exercise 3.5.7. Exercise 3.5.7 The prevalence of mild myopia (nearsightedness) in adults over age 40

Calculate the mean, µY, of the random variable Y from Exercise 3.5.7.
Exercise 3.5.7
The prevalence of mild myopia (nearsightedness) in adults over age 40 is 25% in the U.S. Suppose four adults over age 40 are chosen at random from the population; let Y denote the number with myopia out of the four. Then the probability distribution for Y is given by the following table:

Y (No. Myopic) Probability 0.316 0.422 0.211 0.047 0.004 1000 3 4 Total

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