# a. A certain company sends 40% of its overnight mail parcels via express mail service E 1 . Of these parcels, 2% arrive after the guaranteed delivery time (denote the event “late delivery” by L ). If a record of an overnight mailing is randomly selected from the company’s file, what is the probability that the parcel went via E 1 and was late? b. Suppose that 50% of the overnight parcels are sent via express mail service E 2 and the remaining 10% are sent via E 3 . Of those sent via E 2 , only 1% arrive late, whereas 5% of the parcels handled by E 3 arrive late. What is the probability that a randomly selected parcel arrived late? c. If a randomly selected parcel has arrived on time, what is the probability that it was not sent via E 1 ?

### Probability and Statistics for Eng...

9th Edition
Jay L. Devore
Publisher: Cengage Learning
ISBN: 9781305251809

### Probability and Statistics for Eng...

9th Edition
Jay L. Devore
Publisher: Cengage Learning
ISBN: 9781305251809

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Chapter
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Chapter 2, Problem 103SE
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