How many samples are taken from AQL Normal Inspection to Toughened Inspection and Relaxed Inspection?

AQL = 0.25, batch is 281 ~ 500, using the general inspection level II for sampling,

Normal inspection: sample size is 50, 0 to 1 back

The more stringent inspection: sample size is 50, 0 to 1 back

Relaxation of the test, the sample size is 20, 0 to 1 back.

The specific method can refer to the national standard "Technical Sampling and Inspection Procedures Part I: Sampling Plan for Lot-by-Lot Inspection by Accepted Quality Limit (AQL) Retrieval". There are detailed tables inside.