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1. A grocery store checkout counter has a service rate of 45 per hour, exponentially distributed, with Poisson arrivals at the rate of 30 per hour. Find the operating characteristics of this system.
2. Suppose students arrive during the office hours of a college professor according to a Poisson process with mean arrival rate l. The professor, who deals with his students one by one, has an exponentially distributed service time of ten per hour. Analyze how the average waiting time is expected to change as the arrival rate l varies from five to eight students per hour.
The U.S. Product Safety Commission issues playground specifications and guidelines to help communities build safe playgrounds.
The length of certain bricks is a random variable with a mean of 8 inches and a standard deviation of 0.1 inch, and the thickness of the mortar between two bricks is a random variable with a mean of 0.5 inch and a standard deviation of 0.03 inch.
In an effort to speed up the customer service process, the company decides to streamline the series of pushbutton menus customers must navigate, cutting the time by 24 seconds. What will the median and IQR of the length of hotline calls become?
What about these descriptive statistics makes you wary or uncomfortable? In other words, if you were a real estate agent, would you go around spouting the answers that you gave above? Explain.
Which of the following events are disjoint and What proportion of the females rated their intelligence less than 7.
The historical reports from two major networks showed that the mean number of commercials aired during prime time was equal for both networks last year.
In hypothesis testing when is a two-tail test used in lieu of a one-tail test?
Suppose that the population standard deviations are known to be 6 and 3, respectively. Conduct a hypothesis test to the manufacturers claim.
Environmentalists concerned about global warming can take a variety of approaches to produce evidence that temperatures are on the rise.
We can show that {Y(t),t ≥ 0} is also a birth and death process. (a) Give the birth and death rates of the process {Y(t), t ≥ 0}.
What percentage of F&G wash-down motors can be expected to operate for more than 17,500 hours? If F&G wants to design a wash-down motor so that no more.
three different assembly methods have been proposed for a new product. a completely randomized three different assembly
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