How will a high outlier in a data set affect the mean and median?

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?

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

Simplify using positive exponents only.