Question

Grafik
lupa semua cara2nya

Answer 1

40-44 = 6 
45-49 = 11
50-54 = 9
55-59 = 3
60-64 = 1
cari nilai tengah:
42 x 6= 252
47 x 11 = 517
52 x 9 = 468
57 x 3 = 171
62 x 1 = 62
jumlah frekuensi : 6+11+9+3+1 = 30
jumlah x.f = 1470
rata-rata/mean = 1470 : 30 = 49
jawabannya : C