The amounts of time per workout an athlete uses a stairclimber are normally distributed, with a mean of 20 minutes and a standard deviation of 5 minutes. Find the probability that a randomly selected athlete uses a stairclimber for (a) less than 16 minutes, (b) between 20 and 28 minutes, and (c) more than 30 minutes. (a) The probability that a randomly selected athlete uses stairclimber for less than 16 minutes is. (Round to four decimal places as needed.)

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