A certain brand of candies have a mean weight of 0.8591 g and a standard deviation of 0.0517. A sample of these candies came from a package containing 468 candies, and the package label stated that the net weight is 399.5 g. (If every package has 468 candies, the mean weight of the candies must exceed 399.5 468 = 0.8537 g for the net contents to weigh at least 399.5 g.) a. If 1 candy is randomly selected, find the probability that it weighs more than 0.8537 g. The probability is 0.5416 . (Round to four decimal places as needed.) b. If 468 candies are randomly selected, find the probability that their mean weight is at least 0.8537 g. The probability that a sample of 468 candies will have a mean of 0.8537 g or greater is (Round to four decimal places as needed.)