I need help finding the 99% confidence interval.

Will your flight get you to your destination on time? To the right are a n 72 histogram and summary statistics for the percentage of delayed arrivals 20- each month from 2001 thru 2006. Consider these data to be a 24.2917 representative sample of all months. There is no evidence of a time # of Months 15- S 2.40347 trend. (The correlation of Flights Delayed % with time is r = 0.002.) 10- Complete parts a through c below. 5- 10 25 Flights Delayed (%)