Question: Continuation of Exercise 3-155. (a) What is the probability that you must call four times to obtain the first answer in less than 30 seconds!

Continuation of Exercise 3-155.

(a) What is the probability that you must call four times to obtain the first answer in less than 30 seconds!

(b) What is the mean number of calls until you are answered in less than 30 seconds?

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