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jumlahkan semua nilai siswa,,
( 35 kali 3) + (36 kali 7) + (37 kali 10) + (38 kali 12) + (39 kali 16) + (40 kali 19) + (41 kali 7) = 105 + 252 + 370 + 456 + 624 + 760 +287 = 2854
Terus dibagi sama jumlah semua frekuensi = 3+7+10+12+16+19+7 = 74
2854 : 74 = 38,567567567567.....