What is the maximum permissible negative deviation of the mass?

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Any product whether it be a detail of the mechanism, the method of determining or bakery product is produced according to certain normative documents (GOST, OST, TU or certified methods), which provide for some measurement parameters, so the measured parameters, e.g., length, width, height, weight, etc. in the document are set to the average values from a large enough sample and valid differences (deviations), for example, the mass of baton 400 +_ 20 g, i.e., allowable deviation -20 negative g and loaf in the trade is allowed with the weight of 400-20 = 380 g , but no less and no more 400 + 20 = 420 g ( +20 g is a positive divergence).
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