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A national air traffic control system handled an average of 47,556 flights during 28 randomly selected days in a recent year. The standard deviation for this sample is 6,251 flights per day. Complete parts a through c below.

a. Construct a 99?% confidence interval to estimate the average number of flights per day handled by the system.

The 99?% confidence interval to estimate the average number of flights per day handled by the system is from a lower limit of to an upper limit of

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