One year consumers spent an average of ?$21 on a meal at a resturant. Assume that the amount spent on a resturant meal is normally distributed and that the standard deviation is ?$4. Complete parts? (a) and? (b) below. a. What is the probability that a randomly selected person spent more than ?$22?? b. What is the probability that a randomly selected person spent between ?$10 and ?$19???