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An inspector has the job of checking a screw-making machine at the start of each day....

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Statistics

An inspector has the job of checking a screw-making machine atthe start of each day. She finds that the machine needs repairspairs one day out of ten. When the machine does need repairs, allthe screws it makes are defective. Even when the machine is workingproperly, 5% of the screws it makes are defective; these defectivescrews are randomly scattered through the day's output. Use acalculator to get approximate answers to the following lowingquestions. What is the probability that the machine is in goodorder if:

a. The first screw the inspector tests is defective?

b. The first two screws are both defective?

c. The first three are all defective?

Answer & Explanation Solved by verified expert
3.7 Ratings (710 Votes)
PMachine need repair on a any given day 110 PMachine need not repait on any given day 9100 Probability that screw is defective on a day when machine is repaired 1 Probability that screw is defetive on a day when machine is correctly working 005 a Pa given screw is defective    See Answer
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