Find the probability of each event.

Question

There are 4 red marbles, 2 black marbles, and 2 green marbles in a box.

P (red) =

P (red or black) =

Answer 1

4 red, 2 black, 2 green

pick one at random

Pr(red) = 4/(4+2+2) = 4/8 = 1/2 = 50%

Pr(red or black) = (4+2)/(4+2+2) = 6/8 = 3/4 = 75%