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Each of 13 refrigerators of a certain type has been returned to a distributor because of an audible, high-pitched, oscillating noise when the refrigerators are running. Suppose that 8 of these refrigerators have a defective compressor and the other 5 have less serious problems. If the refrigerators are examined in random order, let X be the number among the first 6 examined that have a defective compressor. (a) Calculate P(X = 4) and P(X's 4). (Round your answers to four decimal places.) P(X = 4) = 0.4079 P(X = 4) = 0.8205 (b) Determine the probability that X exceeds its mean value by more than 1 standard deviation. (Round your answer to four decimal places.) Consider a large shipment of 400 refrigerators, of which 40 have defective compressors. If X is the number among 25 randomly selected refrigerators that have defective compressors, describe a less tedious way to calculate (at least approximately) P(X's 3) than to use the hypergeometric pmf. We can approximate the hypergeometric distribution with the ( binomial : distribution if the population size and the number of successes are large. Here n = and p = M/N = Approximate P(X