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kelas 1: 5-9 = 7 dikalikan frekuensi (Xi.Fi =>7*10=70)
kelas 2: 10-14 = 12 dikalikan frekuensi (Xi.Fi =>12*20=240)
kelas 3: 15-19 = 17 dikalikan frekuensi (Xi.Fi =>17*35=595)
kelas 4: 20-24 = 22 dikalikan frekuensi (Xi.Fi =>22*45=990)
kelas 5: 25-29 = 27 dikalikan frekuensi (Xi.Fi =>27*25=675)
kelas 6: 30-34 = 32 dikalikan frekuensi (Xi.Fi =>32*32=1024)
Jumlah Xi.Fi => 70+240+595+990+675+1024=3594
dan jumlah frekuensi (Fi): 10+20+35+45+25+32=167
rataan: Xi.Fi dibagi Fi => 3594 : 167 = 21,520958