A bag contains 3 red marbles, 2 blue marbles and 5 green marbles. What is the probability of selecting a blue marble, replacing it in the bag and then selecting a green marble?

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23-03-2016
Mathematics

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A bag contains 3 red marbles, 2 blue marbles and 5 green marbles. What is the probability of selecting a blue marble, replacing it in the bag and then selecting a green marble?

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katie6wpg katie6wpg · Answer 1 · 2016-03-23T22:17:56+01:00

If you are trying to find the probability of completing two actions, you just find the probability of each action individually and then multiply them.

There are 5 + 3 + 2 = 10 marbles total.

The probability of selecting a blue marble is 2/10 or 1/5.

The probability of selecting a green marble is 5/10 or 1/2.

1/5 * 1/2 = 1/10

Therefore, the probability of selecting a blue marble, replacing it in the bag and then selecting a green marble is 1/10.