Random Variables

Suppose you have a bag with 5 blue balls, 3 green balls and 2 red balls. You pick out a ball at random, note down its colour and put it back in the bag. You define a random variable Z that takes the values 0.2 if you get a blue ball, 0.5 if you get a green ball and 0.8 if you get a red ball. What is P(Z = 0.5)?

0.2

0.3

0.5

0.8