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Calls to a customer service center last on average 2.4 minutes with a standard deviation of 1.5 minutes. An operator in the call center is required to answer 69 calls each day. Assume the call times are independent.
What is the expected total amount of time in minutes the operator will spend on the calls each day? Give an exact answer.
What is the standard deviation of the total amount of time in minutes the operator will spend on the calls each day? Give your answer to four decimal places.
What is the approximate probability that the total time spent on the calls will be greater than 174 minutes? Give your answer to four decimal places. Use the standard deviation as you entered it above to answer this question.
What is the value c such that the approximate probability that the total time spent on the calls each day is less than c is 0.91? Give your answer to four decimal places. Use the standard deviation as you entered it above to answer this question.
The number of cars passing over a certain bridge between 11pm and midnight has a Poisson density with lambda = 4. In what proportion of nights would you expect exactly one car to pass over the bridge during this time?
In the end, of course, conclusions are drawn about how an entire population would respond based on the responses from randomly selected group of people.
consider the number of subsets of a set with nelements. use the fact that there are cnk subsets of k elements with
The combined production level should not exceed 1200 units per month. The demand for product II is no more than half the demand for product I.
What is the expected value and variance of daily revenue (Y) from the machine, if X, the number of cans sold per day has E(X)=125, and Var(X)=50?
Choose any medical scientific study who applied a Bayer Theorem and write down the article information (title, author, location, and date) of the article
The Statistical Abstract of the United States reports that the mean daily number of shares traded on the NYSE in 2002 was 1441 million.
Students in the industrial statistics lab at ASU calculate a lot of confidence intervals on mu. Suppose all these CIs are independent of each other.
Explain the difference between testing a single mean and testing the difference between two means. What two assumptions must be met when one is using z test to test differences between two means?
a box contains 3 marbles 1 red 1 green 1 blue. consider an experiment that consists of taking 1 marble from the box
According to recent surveys, 58% of households have a personal computers. If a random sample of 159 is selected, what is the probability that more than 81 but fewer than 105 have a personal computer?
The number of cases of merlot wine sold by a Paso Robles winery in an 8-year period follows:
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