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Banyak data = (35×2) +(36×6) +(38×4) +(40×6) +(41×2)
=70+216+152+240+82
=760
Jumlah data = 2+6+4+6+2
=20
Rata-rata= banyak data: jumlah data
= 760 : 20
=38
Jadi jawabannya B