pakai cara hanya no 9 mohon batuanya hari ini di kumpul

Jawab

Mean ( rata rata )
= [ (5 × 4) + (6 × 5) + (7 × 9) + (8 × 6) + (9 × 10) + (10 × 6) ] / ( 4 + 5 + 9 + 6 + 10 + 6 )
= ( 20 + 30 + 63 + 48 + 90 + 60 ) / 40
= 311 / 40
= 7,775

semoga membantu