SOLUTION: I am still coming up with wrong answers. I have to be doing something wrong. A library determines that its books are returned on time 90% of the time. If 450 books are check ou

Question 795313: I am still coming up with wrong answers. I have to be doing something wrong.
A library determines that its books are returned on time 90% of the time. If 450 books are check out, what is the probability that more than 410 and less than 410 will be returned on time
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A library determines that its books are returned on time 90% of the time. If 450 books are checked out, what is the probability that more than 410 and less than 410 will be returned on time
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Binomial Problem with n = 450 and p(on time) = 0.9
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P(400<= x <= 410) = = binomcdf(450,0.90,410) - binomcdf(450,0.9,399)
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= 0.6127
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Cheers,
Stan H.
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