Concept explainers
Refer to Exercise 3.91. In this exercise, we determined that the mean and variance of the costs necessary to find three employees with positive indications of asbestos poisoning were 150 and 4500, respectively. Do you think it is highly unlikely that the cost of completing the tests will exceed $350?
3.91 Refer to Exercise 3.90. If each test costs $20, find the expected value and variance of the total cost of conducting the tests necessary to locate the three positives.
3.90 The employees of a firm that manufactures insulation are being tested for indications of asbestos in their lungs. The firm is requested to send three employees who have positive indications of asbestos on to a medical center for further testing. If 40% of the employees have positive indications of asbestos in their lungs, find the probability that ten employees must be tested in order to find three positives.
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Mathematical Statistics with Applications
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