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A totally different study of concrete porosity ( y ) with respect to m = unit weight in concrete specimens yielded the following gures: 11

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A totally different study of concrete porosity ( y ) with respect to m = unit weight in concrete specimens yielded the following gures: 11 : 16 , Z :13,- = 1,535.57, 2 y,- = 300.26, 2 an? =179,352.94, E x,- y,- = 32,302.53, 2 y? = 6,458.48. What is the sample standard deviation for y, 35, (Find your answer to 3 decimal places)

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