19. Rata-rata = Jumlah nilai

Jumlah data

= 4 + 6 + 9 + 5 + 8 + 8 + 10

7

= 50

7

= 7,142857.... → 7,14 ton (dibulatkan sampai 2 desimal)

Jawaban: C.

20. 160 = 1

165 = 1

167 = 1

169 = 1

170 = 3

172 = 1

173 = 1

180 = 1

Modus = 170

Jawaban: C.

21. r = 28 ÷ 2 = 14 cm

Setengah lingkaran

L = ½ × π × r²

= ½ × 22/7 × 14 × 14

= ½ × 22 × 2 × 14

= 22 × 14

= 308 cm²

22. K = π × r × 2

= 3,14 × 10 × 2

= 62,8 cm

23. r = 70 ÷ 2 = 35 cm

V = π × r² × t

= 22/7 × 35 × 35 × 25

= 22 × 5 × 35 × 25

= 96.250 cm³

24. 5 sisi

25. Kubus

V = s × s × s

= 14 × 14 × 14

= 2.744 cm³

Tabung

r = 14 ÷ 2 = 7 cm

V = π × r² × t

= 22/7 × 7 × 7 × 10

= 22 × 7 × 10

= 1.540 cm³

Volume = 2.744 + 1.540 = 4.284 cm³