Refer to Exercise 102. Suppose that 50% of the overnight parcels are sent via express mail service E2 and the remaining 10% are sent via E3. Of those sent via E2, only 1% arrive late, whereas 5% of the parcels handled by E3 arrive late.
a. What is the probability that a randomly selected parcel arrived late?
b. If a randomly selected parcel has arrived on time, what is the probability that it was not sent via E1?
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