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 $65, (b)...

Extracted text: 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 $65, (b) between $81 and $110, and (c) more than $120. (a) The probability that a randomly selected utility bill is less than $65 is. (Round to four decimal places as needed.) (b) The probability that a randomly selected utility bill is between $81 and $110 is (Round to four decimal places as needed.) (c) The probability that a randomly selected utility bill is more than $120 is (Round to four decimal places as needed.)