SOLUTION: A marble is randomly selected from a bag of solid-colored marbles. The probability of selecting a blue marble is 7/20. The probability of selecting a green marble is 9/20. What is

Question 1194278: A marble is randomly selected from a bag of solid-colored marbles. The probability of selecting a blue marble is 7/20. The probability of selecting a green marble is 9/20. What is the probability of selecting a blue or green marble?
Answer by ikleyn(52793) (Show Source): You can put this solution on YOUR website!
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A marble is randomly selected from a bag of solid-colored marbles.
The probability of selecting a blue marble is 7/20.
The probability of selecting a green marble is 9/20.
What is the probability of selecting a blue or green marble?
~~~~~~~~~~~~~~~~~

    P(selecting a blue or green marble) = P(selecting a blue marble) + P(selecting a green marble) =

                                        =  +  =  =  =  = 0.8 = 80%.

These events, selecting a blue marble and selecting a blue marble are disjoint, or mutually exclusive events,
so the probability to have one of the two events is the sum of particular probabilities.

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