One year consumers spent an average of ?$24 on a meal at a restaurant. Assume that the amount spent on a restaurant meal is normally distributed and that the standard deviation is ?$5. Complete parts? (a) and? (b) below.
a. What is the probability that a randomly selected person spent more than ?$28?
?P(X >? $28) =
b. What is the probability that a randomly selected person spent between ?$12 and ?$21?
?P($12 < X