00:01
You know, this problem we've been doing a table for the joint distribution of x and y.
00:05
Now, we would like to find a few expected values off of this.
00:12
Now, we want first the expected value of x.
00:17
Now, the expected value of x is equal to the sum of the x times the probability of the x.
00:23
And so we have 2 and 4, and so the probability of 2, if we add up everything, then the 2 column, is 0 .55.
00:30
And so this is 2 times 0 .55.
00:34
And then 4, and the probability of 4 is 0 .45.
00:39
And so adding these together gives us our expected value of 2 .9.
00:47
Now, similarly for y, the expected value of y is equal to the sum of all the y's times their individual probabilities...