To generate a phone bill, observe the duration of the

To generate a phone bill, observe the duration of the call in integer minutes (rounding up). Charge for m = 1,2,3, ... minutes if the exact duration i is m – 1 _t_m. Let Bm denote the event that a call is billed for m minutes. The probability of each event Bm is a = 1- (0.69)13 x 0.116. P[Bm) = a(1 – a)"- where (a) Classify a call as long (L) if the call lasts more than three minutes, then (b) What is the probability that a call will be billed for nine minutes or less? Hint: The probabilities P[

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