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The amounts of time per workout an athlete uses a stairclimberare normally​ distributed, with a...

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 6 minutes. Find the probability that a randomly selected athlete uses a stairclimber for (a) less than 16 minutes, (b) between 21 and 28 minutes, and (c) more than 30 minutes.


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