SOLUTION: Suppose that a student needs to buy 6 books for her history course. The number of books that she will be able to find used is a binomial random variable X with n = 6 and p = 0.30.

Question 670421: Suppose that a student needs to buy 6 books for her history course. The number of books that she will be able to find used is a binomial random variable X with n = 6 and p = 0.30. In other words, the probability that she will find any given book used is 0.30, and is independent from one book to the next.What is the probability that she will find exactly three used books?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
The number of books that she will be able to find used is a binomial random variable X with n = 6 and p = 0.30. In other words, the probability that she will find any given book used is 0.30, and is independent from one book to the next.What is the probability that she will find exactly three used books?
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P(x = 3) = 6C3*0.3^3*0.7^3 = binompdf(6,0.3,3) = 0.1852
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Cheers,
Stan H.
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