The market share of Master Card within all credit card holders in the USA is 36%. A random sample of 100 credit card users has been selected. NOTE: ANSWER D ONLY  (a) What is the mean and standard deviation of the number of credit card users in the sample who carries Master Card? (b) Calculate the probability that 50 or more people carry Master Card in the sample. Use here the binomial distribution to get the exact probability. (c) Use the normal approximation in order to calculate the same probability as in part (b). (d) Calculate the relative error of the normal approximation

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