Explanation Given info: There are 45% of the randomly selected blood donors who have group O blood. Also, 11 blood donors are randomly selected. Calculation: Define the random variable x as the number of blood donors who have group O blood. Here, the number of blood donors ( n ) is 11 and each donor is independent of the other. Also, there are two possible outcomes (donor who have group O blood and donor do not have group O blood) and the probability of blood donors who have group O blood is 0.45. Thus, x follows binomial distribution. The binomial distribution formula is, P ( x ) = n ! ( n − x ) ! x ! p x q n − x Where, n is the number of trials, p is the probability of success in each trial and q is the probability of failure in each trial. Substitute n as 11, x as 9, p as 0.45, and q as 0

Essentials of Statistics, Books a la Carte Edition (5th Edition)

5th Edition

ISBN: 9780321926739

Author: Mario F. Triola

Publisher: PEARSON

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Chapter 5.3, Problem 24BSC

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The probability that exactly 9 of the 11 blood donor with group O blood.

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Chapter 5.3, Problem 23BSC

Chapter 5.3, Problem 25BSC

Chapter 5 Solutions

Essentials of Statistics, Books a la Carte Edition (5th Edition)

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The probability that exactly 9 of the 11 blood donor with group O blood.

Solution Summary: The author calculates the probability that exactly 9 of the 11 blood donors with group O blood is 0.0126.

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