A study found that consumers spend an average of ​$21 per week in cash without being aware of where it goes. Assume that the amount of cash spent without being aware of where it goes is normally distributed and that the standard deviation is ​$3. What is the probability that a randomly selected person will spend more than ​$22​? ​(Round to four decimal places as​ needed.)
b.
What is the probability that a randomly selected person will spend between $ 13 and $19? P($13 less than