Frequent fliers of a certain airline fly a random number of miles each
Frequent fliers of a certain airline fly a random number of miles each year, having mean and standard deviation of 25,000 and 12,000 miles, respectively. If 30 such people are randomly chosen, ap- proximate the probability that the average of their mileages for this year will exceed 25,000; be between 23,000 and 27,000.
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