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A jar contains 20 yellow marbles, 55 green marbles, and 25 purple marbles. You pick one marble from the jar random. What is the theoretical probability of picking a green or yellow marble?Answers: A.20%B.25%C.55%D.75%

User Vinothkr
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Recall that to find the theoretical probability we use the following expression:


\frac{\text{favorable cases}}{total\text{ cases}}.

Since the jar contains 20 yellow marbles, 55 green marbles, and 25 purple marbles, then the jar contains 20+55+25=100 marbles. Therefore, the theoretical probability of picking a green or a yellow marble is:


(20+55)/(100)=(75)/(100)=0.75.

The above decimal number written as a percentage is 75%.

Answer: Option D.

User Moshi
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