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Consider a telephone operator who, on the average, handles five calls every 3 minutes. Let X denote the number of calls in the next minutes. (Hint: think of Poisson) (6 points) (a) What the distribution X follows? (Hint: the parameter in this distribution is the number of calls per minute.) (b) What is the probability that there will be no call in the next minute? (c) What is the probability that there are at least two calls in the next minute