# Council Directive of 20 January 1976 on the approximation of the laws of the Member States relating to the making-up by weight or by volume of certain prepackaged products (76/211/EEC)

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#### 2.3.Checking of the average actual contents of the individual prepackages making up a batchU.K.+E.U.

##### 2.3.1.A batch of prepackages shall be considered acceptable for the purpose of this check if the mean valueU.K.+E.U.

of the actual contents xi of n prepackages in a sample is greater than the value:

In this formula:

Qn

=

the nominal quantity of the prepackage,

n

=

the number of prepackages in the sample for this check,

s

=

the estimated standard deviation of the actual contents of the batch,

t(1 — α)

=

0.995 confidence level of a Student distribution with ν = n — 1 degree of freedom.

##### 2.3.2.If xi is the measured value for the actual contents of the i-th item in the sample containing n items then:U.K.+E.U.
###### 2.3.2.2.and the estimated value of the standard deviation s by the following calculation:U.K.+E.U.
• the sum of the squares of the measured values:

• the square of the sum of the measured values:

then

• the corrected sum

• the estimated variance:

the estimated value of the standard deviation is:

##### 2.3.3.Criteria for acceptance or rejection of the batch of prepackages for checking the mean:U.K.+E.U.
###### 2.3.3.1.Criteria for non-destructive testingU.K.+E.U.
Number in batchNumber in sampleCriteria
AcceptanceRejection
100 to 500 (inclusive)30
> 50050
###### 2.3.3.2.Criteria for destructive testingU.K.+E.U.
Number in batchNumber in sampleCriteria
AcceptanceRejection
Whatever the number (≥100)20

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