Rule 1 – The average weight of a batch must meet or exceed the target (nominal) weight of the batch.
The average weight of products within a batch needs to be the same, or greater, than the declared weight on the packaging (known as the nominal weight). For this, you need to add up all the weights of the sample products and then divide the total weight by the number of samples, this gives you the average weight of the batch.
Example: 500 grams, 498 grams, 501 grams = 1499 grams divide by 3 = 499 grams (average weight)
Before we explain Rule 2 and 3, you need to understand TNE (Tolerable Negative Error).