0:00
All right.
00:01
So in this question, we have a binomial setup where our n is 10 and our probability of being on time is 60%.
00:08
So number one, the probability that at least eight flights are on time.
00:13
So that's going to be the probability of 8, 9, and 10.
00:16
And so what i'm going to do is i'm going to run in my graph and calculator a binomial cdf with 10 trials, probability of success is 60%.
00:27
My lower bound is going to be eight and my upper bound is going to be 10.
00:32
So i'm going to add up the probability of eight, the probability of nine, and the probability of 10.
00:40
And when we do that in our calculator, we get 0 .16729.
00:45
Number two, the probability that at most eight flights.
00:50
So that's going to be the same thing, but our lower bound and our upper bound are going to change...