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It depends to the acceptable risk level in your company. Usually AFR=10 is acceptable in most companies.
AQL - acceptable quality level
It is conventionally 5% (or lower) but there is no good reason for that level.
There can be no set value. An acceptable level of sampling error for a company making high precision machine parts is likely to be very different from the sampling error for household incomes, for example.
You study, understand and practice - as with any other subject.