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Answer Answer : z = ( Sample mean - population mean ) / standard deviation z = ( 63 - 64.6 ) / 1.9 =

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Answer : z = ( Sample mean - population mean ) / standard deviation z = ( 63 - 64.6 ) / 1.9 = - 1.6 / 1.9 = - 0.84 There are 349 teachers at a college . Among a sample of 110 teachers from this college , 66 have doctorates . Based on this sample , estimate the number of teachers at this college without doctorates .

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