00:01
We're looking at adults with smart votes.
00:02
49 % use them in meetings or classes.
00:06
So if you pick a random person, p equals 0 .49, but they use them.
00:10
We're looking at 15 people.
00:13
So n is 15.
00:15
What's the probability that exactly nine of them use them in classes? so the probability, the x is exactly 9.
00:24
What we have here is a binomial distribution.
00:28
We have a series of independent trials, our random sample, with two outcomes, and the probabilities are the same for each person.
00:36
So how do we find the probability for exactly nine of them out of the 15 use them in classes? what are we going to use with binomial formula? the probability of exactly x successes is n choose x, p to be x, 1 minus p to the n minus x.
00:53
So we have these three terms...