Examples CH 4

# Examples CH 4 - Examples CH 4 1 Calculate the mean for the...

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Examples CH 4 1. Calculate the mean for the discrete probability distribution shown here. X 2 4 5 10 P(X) .2 .2 .3 .2 Answer:     µ = Σ xp ( x ) = 2(.2) + 4(.3) + 5(.3) + 10(.2) = 5.1 2. Ladies Home Journal polled its readers to determine the proportion of wives who, if given a second chance, would marry their husband. According to the responses from the survey, 80% of wives would marry their husbands again. Suppose a random and independent sample of n = 20 wives is collected. Define the random variable X = the number of the 20 wives who would marry their husband again. Then we know X is a binomial random variable. Find the probability that more than 15 of the wives responded that they would marry their husbands again. Answer:      Let a success be a wife who would marry her husband again. Then x is a binomial random variable with n = 20 and p = . 80. (Use Table) P ( X > 15) = 1 - P ( X 15) = 1 - .370 = .630 3. It has been stated that 20% of the general population donate

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## This note was uploaded on 12/29/2011 for the course STA 2322 taught by Professor Leonidbekker during the Fall '11 term at FIU.

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Examples CH 4 - Examples CH 4 1 Calculate the mean for the...

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