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1. How many blood donors should the American Red Cross expect to collect until it gets a donor with Type B blood? 2. What is the probability that the tenth blood donor is the first donor with Type B blood? 3. What is the probability that exactly two of the first 20 blood donors have Type B blood?

1. How many blood donors should the American Red Cross expect to collect until it gets a donor with Type B blood? 2. What is the probability that the tenth blood donor is the first donor with Type B blood? 3. What is the probability that exactly two of the first 20 blood donors have Type B blood?

A First Course in Probability (10th Edition)
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
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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Example: The American Red Cross says that about 11% of the US population has Type B blood. A blood drive is being held at your school. 1. How many blood donors should the American Red Cross expect to collect until it gets a donor with Type B blood? 2. What is the probability that the tenth blood donor is the first donor with Type B blood? 3. What is the probability that exactly two of the first 20 blood donors have Type B blood? 4. What is the probability that at least 2 of the first 10 blood donors have Type B blood? 5. The blood drive has a total of 150 donors. Assuming that this is a typical number of donors for a school blood drive, what would be the mean and standard deviation of the number of blood donors who have Type B blood? 6. Surprised by the low number of Type B blood donors at the blood drive, the American Red Cross wonders if the 11% estimate was too high for your area. How many Type B blood donors would it take to convince you that the estimate might be too high? Justify your answer.
Transcribed Image Text:Example: The American Red Cross says that about 11% of the US population has Type B blood. A blood drive is being held at your school. 1. How many blood donors should the American Red Cross expect to collect until it gets a donor with Type B blood? 2. What is the probability that the tenth blood donor is the first donor with Type B blood? 3. What is the probability that exactly two of the first 20 blood donors have Type B blood? 4. What is the probability that at least 2 of the first 10 blood donors have Type B blood? 5. The blood drive has a total of 150 donors. Assuming that this is a typical number of donors for a school blood drive, what would be the mean and standard deviation of the number of blood donors who have Type B blood? 6. Surprised by the low number of Type B blood donors at the blood drive, the American Red Cross wonders if the 11% estimate was too high for your area. How many Type B blood donors would it take to convince you that the estimate might be too high? Justify your answer.
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