Thompson and Thompson is a steel bolt manufacturing company. Their current steel

Question

Thompson and Thompson is a steel bolt manufacturing company. Their current steel bolts have a mean diameter of 148 millimeters. And a standard deviation of 7. If a random sample of 31 steel bolts is selected why is the probability that the sample mean would differ from the population mean by more than 2.2 millimeters Thompson and Thompson is a steel bolt manufacturing company. Their current steel bolts have a mean diameter of 148 millimeters. And a standard deviation of 7. If a random sample of 31 steel bolts is selected why is the probability that the sample mean would differ from the population mean by more than 2.2 millimeters

Explanation / Answer

P( x > 2.2 )

P( z > 2.2 / ( 7 / srqt 31 ) )

P( z > 1.75) = 0.0401

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