Agym charges $25 per month plus $4 extra to swim in the pool for an hour. if a member only has $45 to spend each month, at most how many hours can the member swim?

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $36.98. find the probability that a randomly selected bill will have an amount greater than $173, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?