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According to Money, the average U.S. government bond fund earned 3.9% over the 12 months ending in February 2007. Assume a standard deviation of 0.5%.
What is the probability that the average earning in a random sample of 25 bonds exceeded 3.0%?
Statistics and Probability, Statistics
A local postal carrier distributes first-class letters, advertisements, and magazines. For a certain day, she distributed the following number for each type of item. Delivered to First Class Letters Ads Magazines Home ...
John plans to take three suits on his business trip. If John owns 8 suits, how many ways can the 3 suits be selected?
If we are interested in job satisfaction. Name a variable that correlates with job satisfaction but we do not have causation. Name a variable that you believe may have a casual relationship with job satisfaction. Name a ...
Many restaurants and eateries are now posting calorie counts on their menus. We wonder if providing the calories results in customers ordering fewer calories than when the calories are not provided. We will use data from ...
The Dow Jones Industrial Average has had a mean gain of 432 pear year with a standard deviation of 722. A random sample of 40 years is selected. What is the probability that the mean gain for the sample was between 200 a ...
In a certain? state, pickup trucks account for 21?% of the? state's registered vehicles. If 100 registered vehicles are selected at? random, what is the expected number of pickup? trucks?
Jane must get at least three out of four problems on the exam correct to get an A. She has been able to do 60% of the problems on old exams, so she assumes that the probability she gets a given problem correct is 0.6. Sh ...
A researcher calculates a 90% confidence interval of (3397, 3421) to estimate the population birth weight using a random sample of 84 babies born to mothers with gestational diabetes. She wants to compare this range to t ...
Below are commute times and amounts of rainfall for a few randomly selected dates last year. Rain (mm) Commute time (min) 3 20 0 10 1 25 9 30 15 60 12 25 Treat "Rain" as the X variable Compute the value of r for the corr ...
A population has a mean u=81 and a standard deviation o=28. Find the mean and standard deviation of a sampling distribution of sample means with a sample size n=239. ux= ox=
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