At a doctor's office, patients arrive at a rate of ten per hour. With a probability of 1/2, each is either young or old. Assume you know that exactly ten young people arrived within an hour (say, 10 to 11am) a) Compute the pr

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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At a doctor's office, patients arrive at a rate of ten per hour. With a probability of 1/2, each is either young or old. Assume you know that exactly ten young people arrived within an hour (say, 10 to 11am)

a) Compute the probability that exactly 10 old patients also entered.

b) Compute the probability that at least 20 patients have entered

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