The waiting times for all customers at a supermarket produce a normal distribution with a mean of 5.5 minutes and a standard deviation of 1.5 minutes. Find the probability that the waiting time for a randomly selected customer at this supermarket will be a.) less than 3.25 minutes (4 points) b.) more than 6 minutes (4 points) The stress scores of all CEOS (Chief Executive Officers) have a normal distribution with a mean of 6.90 and a standard deviation of .80. Find the percentage of all CEOs who have a stress score of a.) b.) at least 8.3 (4 points) between 5 and 7 (4 points)