What is the probability that a 57 % free-throw shooter will miss her next free throw?

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?

When you answer this can you explain

Prove that 16^4-2^13-4^5 is divisible by 11.