The amounts of time per workout an athlete uses a stairclimberare normally distributed, with a mean of 23 minutes and a standard deviation of 5 minutes. Find the probability that a randomly selected athlete uses a stairclimber for (a) less than 19 minutes, (b) between 23 and 32 minutes, and (c) more than 30 minutes. (a) The probability that a randomly selected athlete uses a stairclimber for less than 19 minutes is (Round to four decimal places as needed.)