SOLUTION: I've spent 3 hours on this one, any help would be much appricated. A bag contains 12 colored balls, each ball being either black or white. The probability of drawing a white bal

Question 885782: I've spent 3 hours on this one, any help would be much appricated.
A bag contains 12 colored balls, each ball being either black or white. The probability of drawing a white ball twice with replacement is 1/16. How many white balls are in the bag?
Thanks in advance.
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
A bag contains 12 colored balls, each ball being either black or white. The probability of drawing a white ball twice with replacement is 1/16. How many white balls are in the bag?
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1/16 = (1/p)*(1/p) with replacement
1/p = 1/4
1/4 of 12 = 3 white balls

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