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Yet another study of concrete porosity ( y ) with respect to a = unit weight in concrete specimens yielded the following figures: n =

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Yet another study of concrete porosity ( y ) with respect to a = unit weight in concrete specimens yielded the following figures: n = 18, Ci = 1,638.22, yi = 297.49, = 179,846.50, MM Ci yi = 32,303.15, >y = 6,439.20. What is the sample standard deviation for , S, (Find your answer to 3 decimal places)

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