6.8 An office worker receives an average of 22.5 e-mail messages per day. If his working day...

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6.8 An office worker receives an average of 22.5 e-mail messages per day. If his working day lasts seven and a half hours, what is the probability that:

(a) He receives no e-mails in an hour?

(b) He receives one e-mail in an hour?

(c) He receives two or fewer e-mails in an hour?

(d) He receives more than four e-mails in an hour?

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