# The Education (School Performance Information) (Wales) Regulations 1998, Paragraph 3


In the case of information which is to be given as a percentage, it shall be determined by applying the formula—
A+B+CD+E+F×100, where
A, B and C are the number of pupils falling into the relevant category of pupils in, respectively, the first, second and third years of the relevant three year period in respect of which the determination is being made; and
D, E and F are the total number of pupils falling into the cohort in relation to, respectively, the first, second and third years of that period.

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Source: https://www.legislation.gov.uk/uksi/1998/1867/schedule/5/paragraph/3 (the official version)
Page: https://openlegislation.uk/education-school-performance-information-wales-regulations-1998/schedule-5/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.