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 wholenumbers.)