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rataan XB = (23+9x)/5
ratatan XA = 2+(2x-1)+6+4+8+1+(x+6)]/7
ratatan XA = (26+3x)/7
sehingga
rataan XB = 2 ( rataan XA)
(23+9x)/5 = 2[(26+3x)/7]
(23+9x)/5 = (52 +6x)/7
(kalikan ruas kiri dan kanan dengan
kpk(5,7) = 35)
7(23+9x) = 5(52 +6x)
161 + 63x = 260 + 30x
63x - 30x = 260 -161
33x = 99
x = 99 : 33
x = 3
Jawab
Nilai x adalah 3
@ Wello1☺☺☺☺☺...
rata-rata Data A
= (2+6+4+8+1 + x+6 + 2x-1) ÷ 7
= (26 + 3x) ÷ 7
Data B = 10, 4x, 8, 5x, 5
rata-rata Data B
= (10+8+5 + 4x + 5x) ÷ 5
= (23 + 9x) ÷ 5
rata-rata B = 2 rata-rata A
Nilai x = 3