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Probability question.

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by mschling52 » Mon Oct 01, 2007 10:49 am
The probability of picking a blue ball will be 12 divided by the total number of balls. Since the total number of balls will be 12+y, we want y to be a number such that

12/(12+y) < 2/5

Cross multiply to get

60 < 24+2y
36<2y
18<y

Therefore, y must be at least 19 for the probability of selecting a blue ball to be less than 2/5
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by raulverde » Mon Oct 01, 2007 10:52 am
Are the wordings correct ? coz i cant make sense of the question
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