00:01
In this question, we are given information about students in a physics class.
00:06
We are given information about how many of them are physics majors and how many of them are female.
00:11
Using this, we need to find the probability that a randomly selected student is female or a physics major.
00:17
So we need to find the probability that a randomly selected student is a physics major or female.
00:25
So let us consider p as the event that the student is a physics major.
00:33
Let us consider f to be the event that the student is female.
00:36
We need to find p of p union f.
00:39
And using the addition law of probability, this is equal to p of p plus p of f minus p of p intersection f.
00:50
So first of all, let us consider p of p.
00:53
That is the probability that a student is a physics major.
00:55
So that is the number of favorable outcomes divided by the total number of outcomes.
01:00
Now there are a total of 18 physics majors, so that's the number of favorable outcomes.
01:05
And the physics class has 40 students, so the total number of outcomes is 40...