Consider a hot-line telephone that has no second line. When the telephone is busy, the new callers get a busy signal. People call at the average rate of 2 calls per minute. The average duration of a telephone conversation is 1 minute. The system behaves like a Bernoulli singleserver queuing process with a frame size of 1 second (b) What is the probability that more than 150 people attempted to call this number between 2 pm and 3 pm?