Length in ft x Width in ft. x depth in ft. = Cubic feet, divide by 27 to get yards of concrete needed.
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You cannot calculate standard deviation for objects such as concrete cubes - you can only calculate standard deviation for some measure - such as side length, surface area, volume, mass, alkalinity or some other measure.
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Get the summation of the AREA of all columns and multiply with the effective height.
it would depend entirely on the rebar design.....
If it is a cubical block, the volume is simply length x height x width.