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Study Resources (Statistics)

The specified (required) mean and max (90th percentile) elapsed time to repair an item is 3.2 hours and 7.4 hours, respectively. The time to repair probability distribution is not specified. Evaluate this requirement in terms of the mean, median and max (90th, 95th and 99th percentiles) elapsed time to repair.
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The Skelton Manufacturing Company recently did a study of its customers. A random sample of 25 customer accounts was pulled from the computer records. Two variables were observed: y-Total dollar value of business this year x- Miles customer is from corporate headquarters The following statistics were computed: y = 2.14023.
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The staff of a grocery products manufacturer is developing a model for the production and distribution of its cereal products. The model requires transportation costs for a very large number of origins and destinations. It is impractical to do the detailed tariff analysis for every possible combination, so a random.
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The statistical analysis of he long-distance calls made from the headquarters of the Bricks and clicks computer corporation indicates that the length calls is normally distributed with mu = 233 seconds and sigma = 35 seconds. What is the probability that a randomly selected call lasts. a) between 180 and.
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The Speedway Clinical Laboratory is a scientific blood-testing facility that receives samples from local hospitals and clinics The blood samples are passed through several automated tests and the results are printed through a central computer that reads and stores the information about each sample that is tested Management is concerned.
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The State Highway Patrol periodically samples vehicles at various locations on a particular highway to test the hypothesis that the average speed exceeds the set limit of 70 mph. These locations are the best locations for radar patrol cars to catch speeders. At a particular location, a sample of 30.
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The size of cash payments made by 119 customers at a petrol station are summarized in the following grouped frequency distribution. Plot a cumulative relative frequency graph. [3 Marks] Payment (£) Frequency Relative Frequency Cumulative relative Frequency 5.00-9.99 15 15/119 = 0.126 0.126 10.00-14.99 37 37/119 = 0.311 0.437 15.00-19.99.
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