Question

Kak dijwab butuh banget buat besok nanti yg jwb di follow like(yg dibuletin aja ya kak)lumayan kak.poinnya

Answer 1

cari dulu ∑ f.x nya

5 × 60 = 300

5 × 70 = 350

4 × 80 = 320

5 × 90 = 450

1 × 100=100

∑ f.x = 300+350+320+450+100 = 1.520

∑f = 5 + 5 +4 + 5 + 1 = 20

X rata² = ∑f.x / ∑ f

X rata² = 1520/20

X rata² = 76

jawabannya (B)