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The amounts of time per workout an athlete uses a stair climber are normally distributed, with a mean of 20 minutes and a standard deviation

The amounts of time per workout an athlete uses a stair climber are normally distributed, with a mean of 20 minutes and a standard deviation of 7 minutes. Find the probability that a randomly selected athlete uses a stair climber for (a) less than 16 minutes, (b) between 20 and 28 minutes, and (c) more than 30 minutes

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