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An electronic switching device occasionally malfunctions and may need to be replaced. The device is considered Satisfactory ifit makes on average no more than 0.2 errors per hour. A particular 5 hour period is chosen to test the device. If the occurrence of errors is a Poisson process.
I) What is the probability that a satisfactory device will be rejected?
II) What is the probability that a device will be considered satisfactory if the error rate = 0.25?
The firm has already decided that any sample mean below 78 or above 82 will signal the workers that the process is not working properly.
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A check of dorm rooms on a large college campuses revealed that 38% had refrigerators, 52 percent had TVs and 21 percent had both a TV and a refrigerator. What's the probability that a randomly selected dorm room has.
What is sampling with replacement, and why it is used?
snowfalls occur randomly and independently over the course of winter. the average is one snowfall every 3 days.a what
A company sampled 40 of the springs that it manufactures for use in small engines and discovered that 20% of the springs did not meet specifications.
Let Z be a standard normal random variable. Calculate the following probabilities using the calculator provided. Round your responses to at least three decimal places.
Of 146 adults selected randomly from one town, 31 of them smoke. Construct a 99% confidence interval for the true percentage of all adults in the town that smoke.
the number of items sold by freds candy store for 2004 and 2007 and the store prices for the two periods
Describe a where you might want to use a dummy variable in a multiple regression. What would the dummy variable buy you in that situation?
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