00:01
In this problem, let x equal to the number of dvds rent.
00:19
So we have a probability distribution or probably a mass function here to be exact.
00:26
So we have x are the values that the random variable could take.
00:30
And we have p of x, which is a probability.
00:36
So this is given for us, well, most of them.
00:40
0 1, 2 are given 3 we need to find and 4 and 5 are given so probably that x equal 0 .03 the probability that x equal 1 is 0 .51 and so on so next one is 0 .25 and 0 .07 and 0 .0 .0 .0 .0 .0.
01:12
So we need to find this probability.
01:18
But one of the characteristics of a probability of a probability mass function is that all the probabilities add up to 1.
01:24
So that's exactly what we're going to use.
01:27
So this is part b.
01:30
I have the probability that x is equal to 3 when you figure that.
01:36
So this is equal to 1 minus.
01:39
So we're using the compromise.
01:41
It's 1 minus...