The normal range of ferritin in children increases as they age. In children between the ages of 1 and 5 years, the normal range is 6 to 24 ng/mL. In children between 5 and 9 years of age, the normal range increases to 10 to 55 ng/mL. These levels continue to increase into adulthood, at which point they can be up to 200 ng/mL.
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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.
It may or may not be acceptable. If the mean is 12, then no it is not acceptable. If the mean is 1000, then it may be acceptable depending on the criteria given.