Consider the chance experiment described in the previous exercise. Suppose that the probability of an overnight delivery selection is 0.1, the probability of a second-day delivery selection is 0.3, and the probability of a standard-delivery selection is 0.4. Find the following probabilities.

a. the probability that a randomly selected online purchase selects delivery to the nearest store for customer pick-up.

b. the probability that the customer selects a form of expedited delivery.

c. the probability that either standard delivery or delivery to the nearest store is selected.