00:01
We're looking at a probability distribution here.
00:04
We have the possible values of x being 0, 1, 2 or 3, a number of televisions per household.
00:11
And the probability of getting a house with each of these possibilities, 0 .05 for having 0 .19, 0 .3 ,0 .0 .4 .4.
00:23
Part a, we want the probability of selecting a house that has 1 or 2, televisions.
00:29
So when you can have 1 or 2, we add these up.
00:34
So we get 0 .51.
00:38
Generally in probability, the probability of x or y is a probability of x plus a probability of y minus the overlap, probability of x and y.
00:52
So we don't have to worry about this overlap here.
00:55
So here it's 0, so we don't have to worry and we just add them up.
01:00
There's no overlap because you cannot have both one and two houses.
01:04
So x or y, we're just adding.
01:08
Part b, two or more.
01:11
So it could be two or three.
01:13
Either of those work...