The average time it takes for a Conancorp unpaid intern to run fourteen stories of stairs to get their manager a coffee is 7 minutes, with a standard deviation of 0.7 minutes. If we select 4 interns at random, what is the probability that their average time will be between 6 minutes and 6.4 minutes? (a) 8.8% (b) 4.2% (c) 3.9%

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