Ninety small bolts are packed in a box. Each bolt weights 1.2 ounce, with a stan

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Ninety small bolts are packed in a box. Each bolt weights 1.2 ounce, with a standard deviation of 0.04 ounce. Find the probability that a box weighs more than 100 ounces. Suppose that you have a sample of 100 values from a population with mean mu = 500 and with standard deviation sigma = 80. What is the probability that the sample mean will be in the interval (490, 510)? Give an interval that covers the middle 95% of the distribution of the sample mean. A large freight elevator can transport a maximum of 9800 pounds. Suppose a load of cargo containing 49 boxes must be transported via the elevator. Experience has shown that the weight of boxes of this type of cargo follows a distribution with mean mu = 205 pounds and standard deviation sigma = 15 pounds. Based on this information, what is the probability that all 49 boxes can be safely loaded onto the freight elevator and transported? The life of a tube (X1) and the filament diameter (X2) arc distributed as a bivariate normal random variable with the parameters mu = 1800 hours, mu2 = 0.05 inch, sigma1 = 400 hours,sigma2 = 0.2 inch, and sigma = 0.8. The quality-control manager wishes to determine the life of

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Ninety small bolts are packed in a box. Each bolt weights 1.2 ounce, with a stan

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