D Question 2 10 pts The random variable Y is the number of persons living in a randomly selected occupied housing unit. Its probability distribution is as follows. y 1 2 3 4 5 6 7 P(Y = y) 0.265 0.327 0.161 0.147 0.065 0.022 0.013 (Round your answers to three decimal places) a) Calculate the mean (expected value) of the random variable Y . E())= M = b) Calculate the standard deviation of the random variable Y. o ( Y ) =