00:01
Let's begin this question by listing all of the things that we are told in the question.
00:07
First, 98 % of all babies survive birth or survive delivery, so that is that sb the event of surviving delivery.
00:17
That probability is 0 .98.
00:21
15 % of all births involve caesarean sections, and if a cesarean is performed, then the probability survival is slightly reduced to 0 .9 .7.
00:34
So that's what we have.
00:39
And what we are asked is the probability of survival if the woman does not have a c -section.
00:50
So that can be stated as the probability of s.
00:54
And we'll call that c complement.
00:56
So that is the event of not having a cesarean section.
01:05
We can use the law of total probability to solve this problem.
01:10
If we state the probability of survival, there is two roots.
01:18
The mother can have a caesarean and the baby survives.
01:22
Or the mother cannot have a cesarian and the baby survives...