11.4 An engineer takes a sample of 5 steel I beams from a batch, and measures the...

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11.4 An engineer takes a sample of 5 steel I beams from a batch, and measures the amount they sag under a standard load. The amounts in mm are:

5.19 4.72 4.81 4.87 4.88 It is known that the sag is normal (p, u2) where the standard deviation u = .25 is known.

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