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pengguna mobil pribadi = 70 org
20% x = 70 org
x = 70 org × 100/20
x = 350 org (D)
22. jml nilai×frekuensi = 108+9x
jml frekuensi = 16+x
rata" = jml nilai×frekuensi/ jml frekuensi
7,2 = 108+9x/16+x
7,2 × (16+x) = 108+9x
1,8x = 7,2
x = 4 org (B)
% mobil pribadi = 100% - (30% + 40% + 10%) = 20%
jmlh siswa= 100/20 × 70 orang = 350 orang (D)
22) rata2 = 7,2
jmlh siswa = 16 + X
Jmlh nilai = 108 + 9x