Question

A spinner has 6 equal sized slices numbered from 1 to 6. Some are grey and some are white, as shown below.

Answer the following questions, write each answer as a fraction.

The wheel will be spun and will stop on a slice at random.

a) what is the probability that the wheel stops on number 2?

b) what is the probability that the wheel stops on number 2, given that the wheel stops on a white slice?

Answer 1

a. 1/6
b. 1/3

There’s 6 slices altogether, so the probability of it landing on 2 is 1/6
There’s 3 white slices, so the probability of it landing on 2 if it only lands on a white slice is 1/3