14.53 less then or greater then 16.3

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?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Solve this problem! extra ! 3025/5.5 = a/90.75 / = fraction