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Question: In a recent study reported Oct.29, 2012 on the Flurry Blog, the mean age of tablet users is 35 years. Suppose the standard deviation is ten years. The sample size is 39.
a. What are the mean and standard deviation for the sum of the ages of tablet users? What is the distribution?
b. Find the probability that the sum of the ages is between 1,400 and 1,500 years.
c. Find the 90th percentile for the sum of the 39 ages.
you play two games against the same opponent. the probability that you win the first game is 0.4. if you win the first
You have just started own airline. You have one plane for a route connecting Austin, Boise, and Chicago. One route is Austin-Boise-Chicago and a second route is Chicago-Boise-Austin.
Calculate p value? What is the critical value?
Understandably, the movie industry would like to know what makes a movie successful. Data from 120 first-run movies released in 2005 suggest that longer movies actually make less profit.
if there is sufficient evidence to conclude that the proportion of adults who support the death penalty is higher in the U.S.A. than in Germany
According to tables provided by the U.S. National Center for Health Statistics in Vital Statistics of the United States. Determine the probability distribution of the number alive at age 65.
Test two integrated circuits. In each test, the probability of rejecting the circuit is p. Let X be the number of rejects (either 0 or 1) in the first test and let Y be the number of rejects in the second test. Find the joint PMF PX,Y (x, y).
a. What is the best point estimate of the population mean net change in LDL cholesterol after the garlic treatment? b. Construct a 90% confidence interval of the mean net change in LDL cholesterol after the garlic treatment.
It has been reported that 80% of taxpayers who are audited by the Internal Revenue Service end up paying more money in taxes. Assume that auditors are randomly assigned to cases, and that one of the ways the IRS oversees its auditors is to monitor..
Initially the wheel rotates with an angular speed W, causing the block to rise with a linear speed v = 0.33 m/s. Find the moment of inertia of the wheel if the block rises to a height of = 7.9 before momentarily coming to rest.
Use the binomial formula to find the probability of 3 or more heads.- Compare your answer with the one that you would obtain if the coin were fair.
Standard deviation of 2.5 inces approximately what percentage of american women are taller than 58.5 inches, but shorter than 68.5?
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