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A telephone company's goal is to have no more than five monthly line failures on any 100 miles of line. The company currently experiences an average of two monthly line failures per 50 miles of line. Let x denote the number of monthly line failures per 100 miles of line. Assuming x has a Poisson distribution:
a. Find the probability that the company will meet its goal on a particular 100 miles of line.
b. Find the probability that the company will not meet its goal on a particular 100 miles of line.
c. Find the probability that the company will have no more than five monthly failures on a particular 200 miles of line.
d. Find the probability that the company will have more than 12 monthly failures on a particular 150 miles of line.
A sample of 25 students enrolled in the university indicates that X (bar) = $285.4 and s = $42.20. Using the 0.05 level of significance, is there evidence that the population mean is above $300?
Exercise 11 The accompanying table gives sample means and standard deviations, each based on n = 6 observations of the refractive index of fiber-optic cable. Construct a control chart, and comment on its appearance
A type I error is the mistake of rejecting the null hypothesis when it is actually true.
Government Programs This chapter described many forms of government insurance and guarantee programs. What motivates a government to establish such programs?
Suppose you estimate a regression model to predict weekly expenditures on food per person. Would you be pleased if your model estimate a Standard Error =$300 EXPLAIN?
in a sample of seven cars each car was tested for nitrogen-oxide emissionsin grams per mile and the following results
randomly pick up 5 cards from a deck of 52 cards. find the probability that the third card is red if the first card is
find the z values based on a standard normal distribution for an 86 confidence interval for a proportion for a 78
This weekend the team has two games against teams they are not very familiar with. Assuming that the ?rst team they play is a class 1 team with probability 0.6 and the second is, independently of the class of the ?rst team, a class 1 team with ..
Remember our sample of pages in this book from the earlier Just Checking? 48% of pages had a data display. 27% of pages had an equation.
What is the probability that six consecutive integers will be chosen as the winning numbers in a lottery where each number chosen is an integer.
Construct the following syllogisms- A valid syllogism having mood OAO and these terms: major-things capable of replicating by themselves; minor-structures that invade cells; middle-viruses.
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