Ineed with this i dont get it at all and its due today, i will give brainliest and all my points.

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?

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items

65% of students in your school participate in at least one after school activity. if there are 980 students in you school, how many do not participate in an after school activity?