Mohon dibantu yah, terimakasih :) Tabel : Nilai : 38, 43, 48, 53, 58 frekuensi: 6, 8, p, 9, 5 Jika nilai rata-rata data dalam tabel sama dengan 47,875 , nilai p

{(38x6)+(43x8)+(48xp)+(53x9)+(58x5)}/(6+8+p+9+5) = 47,875

(228+344+48p+477+290)/(28+p) = 47,875
(1339+48p)/(28+p) = 47,875
1339+48p = 47,875(28+p)
1339+48p = 1340,5 + 47,875p
48p - 47,875p = 1340,5 - 1339
0,125p = 1,5
p = 1,5/0,125
p = 12 (d)

38 x 6                = 228
43 x 8                = 334
48 x p                =48P
53 x 9                 = 477
58  x 5                = 290
       28 +P.       . 1.339+ 48P
Total frekwensi = (28 + P)
Total nilai = (1.339 + 48P)
rata-rata x frekwesi = Total nilai
47,875   x (28+P)    = 1.339 +48 P
1.340,5 + 47,875P = 1.339 +48 P
47,875P - 48P = 1.339 - 1.340,5
-0,125P =-1,5
P = 1,5 : 0,125
P = 12 ...(d)