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3. For a frequency distribution in the (a, b, 0) class with random variable N: (i) Pr(N = 2) = 0.0768. (ii) Pr(N = 3) = Pr(N = 4) = 0.03192. Calculate the mean of the corresponding zeromodied distribution, E (N M ), where the random variable is N M and Pr(NM = 0) = 395\" = 0.4