A marble is selected at random from a jar containing 10 red marbles, 50 yellow marbles, and 40 green marbles. Find the theoretical probability that it is either red or green.

Question

P(red or green)=
answer must be an integer or simplified fraction.

Answer 1

Since there are 10 red marbles and 40 green marbles, the total number of marbles that are either red or green is 10 + 40 = 50 marbles.

The total number of marbles in the jar is 10 + 50 + 40 = 100 marbles.

Therefore, the theoretical probability that the marble selected is either red or green is:

P(red or green) = 50/100 = 1/2 = 0.5

So, the theoretical probability that the marble selected is either red or green is 1/2.