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The Time Spent Commuting from Home to Work for All

Question 21

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The time spent commuting from home to work for all employees of a very large company has a normal distribution with a mean of 43.4 minutes and a standard deviation of 12.1 minutes.The probability,rounded to four decimal places,that the mean time spent commuting from home to work by a sample of 21 employees will be between 43.26 and 49.35 minutes is:

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