P(red) + P(green)
P(red) = number of red marbles / total number of marbles = 10/100 = 1/10
P(green) = number of green marbles / total number of marbles = 30/100 = 3/10
P(red or green) = 1/10 + 3/10 = 4/10 = 2/5
Therefore, the theoretical probability that the marble selected is either red or green is 2/5 or 0.4.
A marble is selected at random from a jar containing 10 red marbles, 60 yellow marbles, and 30 green marbles. Find the theoretical probability that it is either red or green.
P(red or green) =
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