What are the chances your flight will leave on time? To the right are a histogram and summary statistics for the percentage of flights departing on time each month from 2001 thru 2006. There is no evidence of a trend over time. (The correlation of On Time Departure % with time is r = - 0.006.) Complete parts a) through c) below. Find a 90% confidence interval for the true percentage of flights that depart on time. Interpret this interval for a traveler planning to fly. Choose the correct answer below. There is a 90% chance that the true mean monthly percentage of on-time departures is within the interval. We can be 90% confident that the interval contains the true mean monthly percentage of on-time departures. A randomly selected month has a 90% chance of having an on-time departure percentage within the interval. 90% of all months have on=time departure rates within the interval.