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The times per workout an athlete uses a stairclimber are normally distributed, with a mean of 20 minutes and a standard deviation of 5 minutes.

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The times per workout an athlete uses a stairclimber are normally distributed, with a mean of 20 minutes and a standard deviation of 5 minutes. An athlete is randomly selected. Find the probability that the athlete uses a stairclimber (i) between 18 and 23 minutes, (ii) for more than 28 minutes, provided he has crossed the mean value. 5b A random var

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