Question

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You select a marble without looking and then put it back. If you do this 25 times, what is the best prediction possible for the number of times you will pick a marble that is not blue?

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Answer 1

15 times

Explanation:

Assuming that you are picking the marbles without replacement, the probability of picking a marble that is not blue is 3/5. This is because there are 3 green marbles and 2 blue marbles in the bag, so out of 5 possible outcomes, 3 of them are not blue.

To find the best prediction for the number of times you will pick a marble that is not blue in 25 trials, you can multiply the probability by the number of trials. This gives you 3/5 x 25 = 15. So, the best prediction is that you will pick a marble that is not blue 15 times out of 25.

Answer 2

15

Explanation:

Green is 3/5 of the set.

3/5 of 25 is 15.