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The manager of the local National Video Store sells videocassette recorders at discount prices. If the store does not have a video recorder in stock when a customer wants to buy one, it will lose the sale because the customer will purchase a recorder from one of the many local competitors. The problem is that the cost of renting warehouse space to keep enough recorders in inventory to meet all demand is excessively high. The manager has determined that if 90% of customer demand for recorders can be met, then the combined cost of lost sales and inventory will be minimized. The manager has estimated that monthly demand for recorders is normally distributed, with a mean of 180 recorders and a standard deviation of 60. Determine the number of recorders the manager should order each month to meet 90% of customer demand.
a study was conducted to measure the effectiveness of a hypnotism in reducing pain. the measurements are centimeters on
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If random sample of 9 loads is selected for weight check, determine probability that mean weight of those loads is more than 40.60 tons.
Use a 0.05 signi cance level to test the claim that when the 13th day of a month falls on Friday, the numbers of hospital admissions from motor vehicle crashes are not aected.
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a confidence interval for the price of gasoline from a random sample of 40 gas stations in a region gives the
a zoo has offers to look over cost of a new lion den. the actual cost y at 200000 is predicted by the pdffx x for 0
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