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Homework: Homework 3 Question 28, 5.2.11-T Part 2 of 3 CELUR 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 $67, (b) between $81 and $100, and (c) more than $130. (a) The probability that a randomly selected utility bill is less than $67 is 0.0030 (Round to four decimal places as needed.) HW Score: 76.92%, 68.46 of 89 points Points: 0.33 of 1 0 (b) The probability that a randomly selected utility bill is between $81 and $100 is (Round to four decimal places as needed) Save
The amounts of time per workout an athlete uses a stairclimber are normally distributed, with a mean of 21 minutes and a standard deviation of 5 minutes. Find the probability that a randomly selected athlete uses a stairclimber for (a) less than 18 minutes, (b) between 21 and 28 minutes, and (c) more than 30 minutes (a) The probability that a randomly selected athlete uses a stairclimber for less than 18 minutes is 0.2742 (Round to four decimal places as needed.) (b) The probability that a randomly selected athlete uses a stairclimber between 21 and 28 minutes is (Round to four decimal places as needed.)