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measurements of the diameter of 1600 plugs gave a mean of 74.82mm and a standard deviation of 0.14mm. calculate; a)the number of plugs likely to

measurements of the diameter of 1600 plugs gave a mean of 74.82mm and a standard deviation of 0.14mm. calculate;

a)the number of plugs likely to have a diameter less than 74.54mm.

b)the number of plugs likely to have a diameter between 74.68mm and 75.10mm.

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