Question

A survey recorded the colour of cars as they passed. Colour Frequency Relative Frequency Red 13 Silver 34 Black 25 White 10 Blue 8 Estimate the number of white cars you would expect to see if 4000 cars passed by?

Answer 1

444

Explanation:

A survey recorded the colour of cars as they passed.

Colour Frequency Relative Frequency

Red 13 13/90

Silver 34 34/90

Black 25 25/90

White 10 10/90

Blue 8 8/90

Total 90

The relative frequency of white cars is 10/90 or 1/9.

If 4000 cars passed by, you'd expect to see

1/9 * 4000 white cars = 444 white cars

Answer 2

About 444 white cars

Explanation:

First add the number of cars, 13+34+25+10+8, you will get 90

Out of 90 cars, 10 are white so 10/90 are white

Then, set up a proportion, 10/90 = x/4,000

Do cross multiplication and your answer should be about 444 white cars.