CLASS-10
FORMULAE FOR QUARTILES

Formulae for Quartiles –

For an ungrouped data containing ‘n’ observations, we have –

                            n

Lower Quartile, Q₁ = (------)th observation, when ‘n’ is even

                            4

                           n + 1

Lower Quartile, Q₁ = (--------)th observation, when ‘n’ is odd

                             4

                             3n

Lower Quartile, Q₃ =  (-------)th observation, when ‘n’ is even

                              4

                           3(n + 1)

Lower Quartile, Q₃ = ----------th observation, ‘n’ is odd

                              4

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