How do I answer part B to this question please?

\fWhat are the chances that your flight will leave on time? A government bureau publishes information about airline performance. Available below are a histogram and summary statistics for the percentage of flights departing on time each month for over a recent 6-year period. There is no evidence of a trend over time. Complete parts a) through c) below. Click the icon to view the histogram and summary statistics. . . . . . a) Check the assumptions and conditions for inference. Which assumptions and conditions are satisfied? Select all that apply. LY A. The Success/Failure Condition is satisfied. LY B. The Independence Assumption is satisfied. C. The Randomization Condition is satisfied. LY D. The 10% Condition is satisfied. E. None of the assumptions or conditions are satisfied. b) Find a 90% confidence interval for the true mean monthly on-time departure rate. The 90% confidence interval is (]]) (Round to two decimal places as needed.)