The amounts of time per workout an athlete uses a stairclimber are normally distributed, with a mean of 22 minutes and a standard deviation of 7 minutes. Find the probability that a randomly selected athlete uses a stairclimber for (a) less than 19 minutes, (b) between 22 and 31 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.) (b) The probability that a randomly selected athlete uses a stairclimber between 22 and 31 minutes is D. (Round to four decimal places as needed.) (c) The probability that a randomly selected athlete uses a smirclimber for more than 30 minutes is :|. (Round to four decimal places as needed.)