The monthly utility bills in a city are normally distributed, with a mean of $100 and a standard deviation of $12.

Find the probability that a randomly selected utility bill is (a) less than $68, (b) between $80 and $100, and (c) more than $130.

Question

(a) The probability that a randomly selected utility bill is less than $68 is

…. ?

(Round to four decimal places as needed)


(b) The probability that a randomly selected utility bill is between $80 and $100 is

…. ?

(Round to four decimal places as needed)


(c) The probability that a randomly selected utility bill is more than $130 is

….?

(Round to four decimal places as needed.)