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Maka,
Tb (Desil-7) = 87,5
Dan,
Frekuensi kumulatifnya adalah jumlah frekuensi di atas 88-92
Fkk = 3+6+20 = 29
Frekuensinya (f) adalah 12
Intervalnya 5
Sehingga,
D₇ = Tb + [ (i₇-Fkk)/f ]i
D₇ = 87,5 + [ (35-29)/12 ]5
D₇ = 87,5 + 6/12 x 5
D₇ = 87,5 + 2,5
D₇ = 90