00:01
All right here we have this problem where you have zero answers being answered correctly.
00:06
So if you have a 10 question multiple choice quiz, 10 multiple choice questions, 10 multiple choice, right? and we're saying four choices each, a, b, c, and d, four choices each.
00:23
And you guess on all of them, then what's the probability of getting zero correct answers, that you get zero.
00:30
Of them right.
00:32
If you are guessing, well, that's going to be a binomial probability problem where the probability of getting something right is going to be equal to one -fourth or 0 .25.
00:45
All right, and you have, let's say, 10 questions, and we're saying, what's the probability that you get x is equal to zero? well, you can set this up by saying, how many ways can i choose zero things out of 10, and then the probability of getting it right is 0 .25, and you get zero of them right...