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Unformatted text preview: LECTURE V STAT 515 January 28, 2010 USCColumbia Lecture 5 – p.1 Exercise 2 • Suppose a poll of 20 voters is taken in a large city. The purpose is to determine X , the number who favor a certain candidate for mayor. Suppose that 60% of all the city’s voters favor the candidate. a . Find the mean and standard deviation of X . b . Use the binomial probability tables to find the probability that X ≤ 10 . c . Use the table to find the probability that X > 12 . Lecture 5 – p.2 What is a Poisson variable(optional)? • Poisson (17811840) is a French mathematician. Poisson variable is a random variable, like Binomial, only assume discrete values, , 1 , 2 ,... . It is very natural to use it to count events. For example, the number of unscheduled admission per day to a hospital, or the number of death claims received per day by an insurance company. • What is the likelihood of having three unscheduled admissions to Lexington hospital for tomorrow? what about 6,10,29 admission? Should these probabilities be increasing, or decreasing?...
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 Spring '10
 Zhao
 Normal Distribution, Probability theory, mass function, Lexington hospital

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