A toll-free phone number is available from 9 a.m. to 9 p.m. to customers who want...

A toll-free phone number is available from 9 a.m. to 9 p.m. to customers who want to register a complaint about a product purchased from your company. Past history indicates that, on average, 0.4 calls are received per hour.

(a) Decide what would be an appropriate distribution to describe the process [2] of people making complaints. Give a justiﬁcation of your answer, in at most one sentence.

(b) Using the distribution in (a), ﬁnd the following probabilities: (i) the probability that zero phone calls will be received; [4] (ii) the probability that one phone call will be received; [4] (iii) the probability that two or more phone calls will be received. [2]

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orchestra answered 1 year ago

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