(c)
the standard deviation (σm ) as follows: where: i | is the counter from 1 to p for the alignment tyres; j | is the counter from 2 to n + 1 for the n last repetitions of each measurement of a given alignment tyre; n + 1 | is the number of repetitions of tyre measurements (n + 1 = 4 for reference laboratories and n + 1 ≥ 4 for candidate laboratories); p | is the number of alignment tyres (p ≥ 5).
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Source: EUR-Lex (Cellar) · retrieved 2026-11-06 · Text as adopted (Official Journal); later amendments are not incorporated in this text.