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1. How many people must be selected to make sure that at least 20 of them were born in the same month? 2. A coin is flipped 4 times. Assume that all outcomes are equally likely. What is the probability that it lands heads up exactly two times? 3. A coin is flipped 10 times. Assume that all outcomes are equally likely. What is the probability that the number of times it lands heads up is different from the number of times it lands tails up?

1. How many people must be selected to make sure that at least 20 of them were born in the same month? 2. A coin is flipped 4 times. Assume that all outcomes are equally likely. What is the probability that it lands heads up exactly two times? 3. A coin is flipped 10 times. Assume that all outcomes are equally likely. What is the probability that the number of times it lands heads up is different from the number of times it lands tails up?

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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1. How many people must be selected to make sure that at least 20 of them were born in the same month? 2. A coin is flipped 4 times. Assume that all outcomes are equally likely. What is the probability that it lands heads up exactly two times? 3. A coin is flipped 10 times. Assume that all outcomes are equally likely. What is the probability that the number of times it lands heads up is different from the number of times it lands tails up?
Transcribed Image Text:1. How many people must be selected to make sure that at least 20 of them were born in the same month? 2. A coin is flipped 4 times. Assume that all outcomes are equally likely. What is the probability that it lands heads up exactly two times? 3. A coin is flipped 10 times. Assume that all outcomes are equally likely. What is the probability that the number of times it lands heads up is different from the number of times it lands tails up?
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