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A bag contains 7 red marbles, 8 blue marbles, and 5 green marbles. Mara randomly chose a marble, then she put it back and randomly chose another marble. What is the probability that she chose 2 blue marbles?
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A bag contains 7 red marbles, 8 blue marbles, and 5 green marbles. Mara randomly chose a marble, then she put it back and randomly chose another marble. What is the probability that she chose 2 blue marbles? Answers in decimal form please.

User Varvara
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1 Answer

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7 + 8 + 5 = 20 total marbles

8 blue

probability of picking a blue marble = 8/20, reduces to 2/5 = 0.40

since she puts the first marble back, the 2nd pick is the same probability as the first one

so the probability of picking 2 blue would be 0.40 x 0.40 = 0.16
User Terry Roe
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