00:01
For this question, they are given some probabilities here.
00:04
And first of all, the probability of y1, the probability of y2 was given here, and we don't know the probability of y3.
00:11
So let's get the probability of y3 first.
00:14
So we know that the probability of y1 plus the probability of y2 and plus the probability of y3 should be equal to 1.
00:22
And the prevalence of y1, that was given as 0 .4.
00:26
And plus the probability of y2, that was given as 0 .3.
00:30
Plus the probability of y3, that should be one here.
00:33
If i add and subtract from 1, i can get the probability of y3 as 1 minus 0 .7, which is 0 .3.
00:40
This is the probability of y3 here.
00:44
And the next step, so we have to find the probability of this is y1 and given x...