A national air traffic control system handled an average of 47,807 flights during 28 randomly selected days in a recent year. The standard deviation for this sample is 6,283 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 nothing to an upper limit of nothing.
?(Round to the nearest whole? numbers.)