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Suppose that the probabilities of a customer purchasing 0, 1, or 2 books at a book store are 0.2, 0.3, and 0.5, respectively. What is the standard deviation of this customer's book purchases?
What is the probability of either X or Y occurring? What is the probability that neither X nor Y will happen?
The grades on the midterm given in a large managerial stats class are normally distibuted with mean 75 and standard deviation 9. Instructors of this class wants to assign an A to top
A machine cuts circular filters from large rolls of material. If 7.3% of the filters fail to meet specifications, use the normal approximation to the binomial to compute the probability
the average weekly stock prices of overseas trading inc. a u.s. based multinational company can be estimated from
Assume this distribution follows a normal distribution. What is the probability that next week's show will: Have between 29 and 37 million viewers?
As part of this trial, they wish to determine whether there is a difference between the effectiveness for women and for men. At = .05, what is the test value?
Ms. Maria Wilson is considering running for mayor of the town of Bear Gulch, Montana. Before completing the petitions, she decides to conduct a survey of voters in Bear Gulch. A sample of 400 voters reveals that 300 would support her in the Novemb..
you notice in your introductory psychology class that more women tend to sit up front and more men sit in the back.
when an opinion poll calls residential telephone numbers at random only 20 of the calls reach a live person. you watch
a health researcher is interested in determining whether or not the speed at which people walk is related to their
Three dessert packages to choose from. In how many different ways could the couple select an appetizer package, a main course,and a dessert package?
Find the 90%, 95% and 99% confidence intervals for the proportion of all voters who favor the issue. How many more voters should we include in the sample if we need to reduce the margin of error by half?
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