Instructor: Okay, so we are moving forward
with this problem,
and now we are with problem two,
and we are looking at Part B.
So in Part B, we are being asked
what is the probability
that the child and both parents are hyperlipidemic?
So now we are not concerned
about one parent being hyperlipidemic.
We are only focusing on when both the child
and both parents are hyperlipidemic.
So, for this problem we need to find the intersection
where the child and both parents are hyperlipidemic,
and that will be as you probably figured, 45.
So I'm going to go ahead and highlight 45,
so it will be easy for us to understand.
I'm going to use a different color again.
I'm going to use orange.
So this is 45.
This is the intersection
where both parents and the child is hyperlipidemic.
So we really don't need to perform any new addition
for the numerator.
Now for the denominator, again,
there are no conditions attached.
So the numerator here will be 45.
And our denominator, again,
there is no conditions or stipulations attached,
so that again will be for that entire cohort.
So that again would be what? 223.
And I'm going to again highlight that with green.
So our denominator is going to be
223,
and our numerator is going to be 45.
So we are looking at this.
The probability
that the child
and both parents
are hyperlipidemic.
And we'll just abbreviate that as HL.
So we are going to take 45 and divide it by 223,
and what we are going to get is 0.202, or 20%.
So there is a 20% probability
that the child and both parents are hyperlipidemic
given the values we have been provided.