Afeature film runs 2 h 12 min. the theater requires 12 min between performances, and has 12 min of previews and short subjects to show before the feature. if the third showing of the films ends at 12: 36, when will the first preview begin

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?