1. (а) A certain company sends 40% of its overnight mail parcels via express mail service E1. Of these parcels, 4% arrive late (after the guaranteed delivery time). If a record of an overnight mailing is randomly selected from the company's file, what is the probability that the parcel went via E1 and was late? Suppose that 50% of the overnight parcels are sent via express mail service E2 (b) and the remaining 10% are sent via E3. Of those sent via E2, only 3% arrive late, whereas 6% of the parcels handled by E3 arrive late. What is the probability that a randomly selected parcel arrived late? (c) it was not sent via E1? If a randomly selected parcel has arrived on time, what is the probability that

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