Paragraph 3.2.4.2 F1

To obtain

Divide the sample, in chronological order of selection, into eight sub-samples of five measuring container bottles each. Calculate as follows:

• — the range of each of the sub-samples, i.e. the difference between the actual capacity of the largest and the smallest of the five bottles in the sub-sample; eight ranges are thus obtained: R_{1 ;} R_{2 ; . . . . . .} R₈

• — the sum of the ranges of the eight sub-samples:

The average range

.