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P(1440<x<1480)
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Quality Textiles International Scenario
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The gestation time for humans has a mean of 266 days and a standard deviation of 25 days. If 100 women are randomly selected, find the probability that they have a mean pregnancy between 266 days and 268 days.
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Totto, an automobile manufacturer, has designed a radically new engine and wants to recommend the grade of gasoline that will have the best fuel economy. The four grades are
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When truckload of apples arrives a a packing plant, a random sample of 150 is selected and examined for bruises, discoloration, and other defects. The whole truckload will be rejected if more than 5% of sample is unsatisfactory. Suppose that in fact 8% of the apples on the truck do not meet the...
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(b) The probability that a sample of 64 all weather tires will have an average life of more than 52,000 miles.
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the lifetime of a semiconductor laser has a lognormal distribution with mean = 10 hours and standard deviation = 1.5 hours. a. what is the probability the lifetime exceeds 10,000 hours? b. what lifetime is exceeded by 99% of the lasers? c. Determine the mean and standard deviation of the...
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The time to failure (in hours) of a bearing is satisfactorily modeled as a Weibull random variable with shape parameter beta =2 and scale parameter theta = 5000 hours. a. Determine the mean time until failure for these bearings. b. Determine the probability that a bearing lasts at least 6000...
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Suppose that the length of a phone call in minutes is an exponential random variable with parameter lambda =1/10. If someone arrives immediately ahead of you at a public telephone booth, find the probability that you will have to wait (a) more than 10 minutes (b) between 10 and 20 minutes?
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Past experience indicates that the variance in the time it takes for a "fast lube" operation to actually complete the lube and oil change for customers is 9.00 minutes. The manager wishes to estimate the mean time with 99 percent confidence and a margin of error of 0.50...
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