Suppose the frequency distribution of customer satisfaction ratings is given below: Rating  Frequency 1 300 2 450 3 200 4 50 Total 1000 A random sample of 400 viewers is selected from his population. Assume that their ratings are independent from each other. (a) What is the probability that at least 120 customers in this sample will give a rating 3 or 4 ? (b) What is the probability that the average rating from this sample is higher than 2.1?

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