Weights and Measures Regulations 1999

Schedule 7A Average quantity system

rr 84A–84F

Schedule 7A: inserted, on 14 November 2001, by regulation 5 of the Weights and Measures Amendment Regulations 2001 (SR 2001/305).

Table 1 Lots and sampling characteristics

Column 1Column 2Column 3Column 4
Number of packages in the lot of packagesMinimum sample sizeSample correction factor (c)Number of non-standard packages permitted in a sample
2200
3300
4400
5500
6600
7700
8800
9900
101000
111100
121200
13–39120.7460
40–79120.8261
80–149120.8602
150–399320.4653
400–4 000320.4834
More than 4 000800.2956

Table 2 Amounts of error for packages labelled by mass or volume

Column 1Column 2Column 3
Stated quantity
(g or ml or cm3)
Amount of error
(% of stated quantity)
Amount of error
(g or ml or cm3)
More than 0 to not more than 509.0
More than 50 to not more than 1004.5
More than 100 to not more than 2004.5
More than 200 to not more than 3009.0
More than 300 to not more than 5003.0
More than 500 to not more than 1 00015.0
More than 1 000 to not more than 10 0001.5
More than 10 000 to not more than 15 000150.0
More than 15 0001.0
Note: For the purposes of this table, if the quantity is stated in units other than grams, millilitres, or cubic centimetres, the quantity must be converted into the equivalent number of grams, millilitres, or cubic centimetres, as appropriate. For example, if the quantity is stated in kilograms, litres, or cubic metres, the quantity must be converted into the equivalent number of grams, millilitres, or cubic centimetres, respectively. The table must then be applied accordingly.

Table 3 Amounts of error for packages labelled by reference to length, width, area, or number

Column 1Column 2
Quantity typeAmount of error
Length or width2% of stated length or width for all packages
Area3% of stated area for all packages
NumberFor packages stated to contain 50 or less goods, 1 good
For packages stated to contain more than 50 goods, 2% of the number of stated goods rounded up to the nearest whole number

Table 4 Number of non-standard packages permitted in sample if sample size selected is more than minimum sample size

Column 1Column 2
Sample size (n)Number of non-standard
packages permitted in
a sample
13–142
15–283
29–444
45–635
64–836
84–1007
More than 100
formula

Note: For the purposes of the formula set out in column 2 (in the case of a sample size of more than 100),—

(a)

n is the sample size; and

(b)

the amount calculated in accordance with the formula must be rounded up to the nearest whole number.

Table 5 Sample correction factor if sample size selected is more than minimum sample size

Column 1Column 2
Number of packages in
the lot of packages
Sample correction factor (c)
13–39
formula
40–79
formula
80–149
formula
150–399
formula
400–4 000
formula
More than 4 000
formula

Note: For the purposes of the formulas included in this table,—

(a)

n is the sample size; and

(b)

t is the amount calculated in accordance with the following formula:

formula

(where n is the sample size).