pliss jawab dong cari a.mean b.median c.modus

mean(rata rata)
= ((2 × 65) + (4 × 70) + (6 × 75) + (7 × 80) + (5 × 85) + (3 × 90)) / 2 + 4 + 6 + 7 + 5 + 3
= (130 + 280 + 450 + 560 + 425 + 270) / 27
= 2115 / 27
= 78,333333333333
= 78,3

median(nilai tengah)
= 80

modus (data terbanyak)
= 80