Question

A box contains 8 balls of the same size but different colours. 4 are red, 3 are blue and 1 is white. If a ball is selected at random,

6.1 What is the probability that a red ball will be selected ? (1)

6.2 What is the probability that a blue or a white ball will be selected? (3)

6.3 What is the probability that a white ball will be selected?

Answer 1

$$4+3+1=8$$

6.1

$$P(red)=\dfrac{4}{8}=\dfrac{1}{2}$$

6.2

$$P(blue\ or\ white)=\dfrac{3+1}{8}=\dfrac{1}{2}$$

6.3

$$P(white)=\dfrac{1}{8}$$