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banyak siswa = jumlah frekuensi
= 1 + 3 + 8 + 10 + 8 + 7 + 2 + 1
= 40
rata² = (1x3 + 3x4 + 8x5 + 10x6 + 8x7 + 7x8 + 2x9 + 1x10)/40
= (3+12+40+60+56+56+18+10)/40
= 255/40
= 6,375
modus = 6 ( sebanyak 10 siswa )
median = Urutan data ke (40+1)/2 = 20,5
median adalah nilai 6
2. nilai rata-rata 10 anak
= (9 x 7,4 + 8)/10
= (66,6 + 8)/10
= 74,6/10
= 7,46