The records of a light bulb manufacturer show that when the manufacturing machinery is working...
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The records of a light bulb manufacturer show that when the manufacturing machinery is working correctly the defect rate due to imperfections in the material used is 1 The manufacturer s control department periodically tests samples of the bulbs and when 1 5 or more are defective they call repair technicians for service The control department is going to take a random sample of 4400 light bulbs Let p be the proportion of defective light bulbs in the sample assuming the machinery is working correctly Answer the following If necessary consult a list of formulas a Find the mean of p 0 b Find the standard deviation of p c Compute an approximation for P 0 015 which is the probability that assuming the machinery is working correctly the repair technicians will be called Round your answer to four decimal places X
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