Quiz 4 (2) - e) Find the actual probability that x falls...

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BA 240 W, Li Score: ___ of 10 QUIZ 4 Show your work CLEARLY and COMPLETELY! Name: _________________________ Round to the THIRD Decimal Place, EXCEPT for Problem 1-a) Problem 1 : Suppose that the probability distribution of a random variable x can be described by the formula 15 ) ( x x p for each of the values x =1, 2, 3, 4, and 5. For example, p(x = 2) = 2 /15 Write out the probability distribution of x in tabular form (Keep in Fraction!) and use it to answer the following questions. a) Find p(x < 3). (1 Point) b) Calculate the expected value (mean). (1 Point) c) Calculate the standard deviation. (1 Point) d) Compute the interval (μ – σ, μ + 2σ). (2 Points) Lower Limit = Upper Limit =
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Unformatted text preview: e) Find the actual probability that x falls within the interval of part d). (1 Point) Problem 2 : A consumer advocate claims that 80 percent of cable television subscribers are not satisfied with their cable service, and suppose that a random sample of 25 cable subscribers is selected. Let x be the number of cable television subscribers who are not satisfied with their cable service. Find the probability that a) More than 20 subscribers are not satisfied with their service. (1 Point) b) 14 to 18 subscribers (inclusive) are not satisfied with their service. (1 Point) c) Find the mean of x . (1 Point) d) Find the standard deviation of x . (1 Point)...
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This note was uploaded on 07/28/2011 for the course STATISTICS BA 240 taught by Professor Winnieli during the Spring '11 term at Bellevue College.

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