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