d) the probability that the number of purchasers buying a new copy is between 3 and 6, extrema included; e) the mean and the standard deviation associated to the random variable r, which indicates the number of purchaser buying a new copy. Problem 3 Suppose that 30% of all students whoNove to buy NXfora prticular course want a new copy, whereas the other 70% want a used cXX osideRodomly selecting 12 purchasers. Find, a) the probability that exactly 8 buANNBEW 0kIW.copy

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