Please only answer if you know it's correct

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?

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?