The lower specification limit for the breaking strength of yarns is 25 g. The distribution of the breaking strength of yarns is normal with a variance of 6. It is desirable that lots with a mean such that 3% of the product is nonconforming be accepted 94% of the time.
Lots with a mean such that 8% of the product is nonconforming should be accepted 7% of the time. Find the parameters of a variable sampling plan and describe its operation.