Question

The two-way table shows information about the subjects studied by

some people.
a)
b)
Male
Female
Total
Chemistry Biology Physics
12
14
16
16
28
20
34
12
28
Total
42
48
90
How many people are male OR study Biology OR both?
What is the probability that any person is male OR
studies Biology OR both?

Answer 1

Part (a)

We can add the total number of males and the total number of students who take biology, and then subtract the intersection.

`42+34-14=62`

Part (b)

There are 90 people in all, so the probability is
`(62)/(90)=(31)/(45)`