Brick Dimension and tolerance

after manufacturing,you will get different sizes,
To find if bricks are “within tolerance” a selection of bricks (at least 10),from a few packs are taken, laid end to end then measured.the total is then divided by the number of bricks to find an average, then this figure checked against the manufacturers tolerances.

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yll ye 190×90×40mm ye 40 mm kyu diya