Could anyone answer A-C for me?

The monthly utility bills in a city are normally distributed, with a mean of $100 and a standard deviation of $15. Find the probability that a randomly selected utility bill is (a) less than $70, (b) between $88 and $100, and (c) more than $110 (a) The probability that a randomly selected utility bill is less than $70 is (Round to four decimal places as needed.)