It’s done by taking 10 capsules and assay each individually by specified procedure, if 9 out of 10 within the requirement of ±15% (85%-115%) limits and the tenth tablet is not outside ±25% (75%-125%) so the batch should be accepted. While if 2 capsules out of 10 fall outside the range ±15% so take 20 capsules and assay them individually and take the average of 30 capsules, so the requirements are met if 27 capsules in the ±15% range and only 3 capsules in the ±25% range.