Question 749574: There are 12 red checkers and 3 black checkers in a bag. Checkers are selected one at a time, with replacement. Each time, the color of the checker is recorded. Find the probability of selecting a red checker exactly 7 times in 10 selections. Show your work.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! There are 12 red checkers and 3 black checkers in a bag. Checkers are selected one at a time, with replacement. Each time, the color of the checker is recorded. Find the probability of selecting a red checker exactly 7 times in 10 selections.
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Binomial Problem with n = 10 and p(red) = 12/15
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P(x = 7) = 10C7*(4/5)^7(1/5)^3 = binompdf(10,4/5,7) = 0.2013
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Cheers,
Stan H.
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