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Data tertinggi ( X.maks ) 9,25data terendah ( X min ) = 3
Jangkauan / Range = Xmaks - Xmin = 9,25 - 3 = 6,25.
Banyak kelas = 1+3,3 log N
= 1+3,3 log36
= 1+3,3 x 1,5561
= 6,13546 ==» 7
jarak interval =6,25/7 = 0,9
interval 3,0 - 3,8 , 3,9 - 4-7, 4,8 - 5,6 dst, lalu ditally/ dicacah.