The monthly utility bills in a city are normally distributed, with a mean of $100 and a standard deviation of $14. Find the probability that a randomly selected utility bill is (a) less than $67, (b) between $83 and $90, and (c) more than $120, (a) The probability that a randomly selected utility bill is less than $67 is (Round to four decimal places as needed.) (b) The probability that a randomly selected utility bill is between $83 and $90 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.)