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Car color preference change over the years and according to the particular model that the customer selects. In a recent year, 10% of all luxury cars sold were black. If 25cars of that year and type are randomly selected, find the following probabilities.(a) At least five cars are black.
(b) At most six cars are black.(c) More than four cars are black.(d) Exactly four cars are black.(e) Between three and five cars (inclusive) are black.(f) More than20 cars are not black.
Group of businesswomen wish to open a high fashion boutique in a vacant store but only if the average income in the area is at least $45,000. Use alpha=0.01 to test whether or not the businesswomen should open their boutique in this neighborhood.
For following scores determine values of each expression: X: 4, 2, 1, & 5. åX, åX 2 , (åX) 2 , å(X-1).
A local bank reports that 80 percent of its customers maintain a checking account, 60 percent have a savings account, and 50 percent have both.
For given population of high school seniors, the schoolastic aptitude test (SAT) in mathemathics has mean score of 500 with the standard deviation of 100.
Find the best point estimate of the mean salary of all NCAA football coaches.
Solving quadratic equations. Discriminant of a quadratic equation. Compute the value of the discriminant and give the number of real solutions to the quadratic equation.
Chi-square test for independent attributes - Are the opinions on the tax cut proposal independent of party affiliation? Use a = 0.01
Martin Motors has in stock three cars of the same make and model. The president would like to compare the gas consumption of the three cars (labeled car A, car B, and car C) using four different types of gasoline.
A standard IQ test has mean of 98 and a standard deviation of 16. We want to be 99% certain that we are 8 IQ points of the true mean. Determine the sample size.
If you want to be 95% confidence of estmating the population mean to within a sampling error of +-4 and the standard deviation is assumed to be 10, what sample size is required?
Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and sixth digits.
A rental agent claims that the mean monthly rent, mu, for apartments on the east side of town is less than $725. A random sample of 13 monthly rents for apartments on the east side has a mean of $724, with a standard deviation of $15.
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