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The time to failure (in hours) of fans in a personal computer can be modeled by an exponential distribution with l=0.0003
What proportion of the fans will last at least 10,000 hours?
What proportion of the fans will last at most 7000 hours?
To estimate the size of the bear population on the Keweenaw Peninsula, conservationists captured, tagged, and released 50 bears. One year later a random sample of 100 bears included only 2 tagged bears.
1.a study of cardiovascular risk factors compared heavy smokers light smokers and nonsmokers. both men and women were
When combining probabilities, to find the probability of one event AND another event, the separate probabilities should be:
The Boss is a small Italian restaurant with 6 waiters and waitresses. The average service time at the restaurant for a table (of any size) in 80 minutes (exponentially distributed).
The security department of a state university is planning its budget for the next year. In estimating the man-hours for security during university sponsored music concerts, the average length of music concerts is needed.
A car rental office checks out an average of 30 cars per day with a standard deviation of 8 cars. If a sample of 25 days of operation is selected and the sample mean is computed.
question if the regression line is drawn as y c 1075x when x was 2 and y was 239 given that the intercept was 11.
Assume a sample of 400 American adults were taken. Show the sampling distribution of the proportion of adults who balance their checkbook at least once a month.
the central limit theorem can be used to analyze round-off error. suppose that the round-off error is represented as a
What is the probability that a single, randomly selected piece of material will be defective? (Give the answer to two decimal places.)
question acid rain has caused many lakes to become more acidic. a lake is considered nonacidic if the ph level is
if we are testing for the difference between the means of 2 related populations with samples of n1 20 and n2 20 the
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