Problem 9
Private Investigation: Locating People Old Friends Information Service is a California company that is in the business of finding addresses of long-lost friends. Old Friends claims to have a 70% success rate (Source: Wall Street Journal). Suppose that you have the names of six friends for whom you have no addresses and decide to use Old Friends to track them. (a) Make a histogram showing the probability of r 0 to 6 friends for whom an address will be found. (b) Find the mean and standard deviation of this probability distribution. What is the expected number of friends for whom addresses will be found? (c) Quota many names would you have to submit to be 97% sure that at least two addresses will be found?

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STAT 2004 WEEK 5 A bar plot is used to summarize categorical variables. PROBABILITY The proportion of times an outcome would occur if repeated infinitely many times. Sample space- Represents possible outcomes. Law of Large Numbers- As the number of trials increases, the estimate goes closer to the true probability. In other words, as a sample size increases. A statistic gets closer to the parameter it is estimating. Example problem one: Find P(7) (probability of rolling a 7) with two fair independent dice. o How can a 7 be rolled S (sample space)= {(1,6) or (2,5) or (3,4) or (6,1) or (5,2) or (4,3)} o Mutually exclusive/disjoint- Cannot both happen to

This full solution covers the following key subjects: . This expansive textbook survival guide covers 57 chapters, and 994 solutions. This textbook survival guide was created for the textbook: Understandable Statistics, edition: 9. Since the solution to 9 from 5.3 chapter was answered, more than 277 students have viewed the full step-by-step answer. The full step-by-step solution to problem: 9 from chapter: 5.3 was answered by , our top Statistics solution expert on 01/04/18, 09:09PM. Understandable Statistics was written by and is associated to the ISBN: 9780618949922. The answer to “Private Investigation: Locating People Old Friends Information Service is a California company that is in the business of finding addresses of long-lost friends. Old Friends claims to have a 70% success rate (Source: Wall Street Journal). Suppose that you have the names of six friends for whom you have no addresses and decide to use Old Friends to track them. (a) Make a histogram showing the probability of r 0 to 6 friends for whom an address will be found. (b) Find the mean and standard deviation of this probability distribution. What is the expected number of friends for whom addresses will be found? (c) Quota many names would you have to submit to be 97% sure that at least two addresses will be found?” is broken down into a number of easy to follow steps, and 125 words.