Question

An automobile dealer has 10 Fords, 7 Buick’s, and 5 Plymouth’s in her used-car lot. If a person purchases a used car, find the probability that it is a Ford or Buick.

Answer 1

The probability is
`0.7727` or
`77.27\%`

Explanation:

we know that

The probability of an event is the ratio of the size of the event space to the size of the sample space.

The size of the sample space is the total number of possible outcomes

The event space is the number of outcomes in the event you are interested in.

so

Let

x------> size of the event space

y-----> size of the sample space

so

`P=(x)/(y)`

In this problem we have

`x=10+7=17`

`y=10+7+5=22`

substitute

`P=(17)/(22)=0.7727`

Convert to percentage

`0.7727*100=77.27\%`