x = frekuensi nilai 7
[tex] \frac{nilai(frekuensi)}{frekuensi} = rata - rata \\ \\ \frac{5(4) + 6(11) + 7x + 8(5) + 9(2)}{4 + 11 + x + 5 + 2} = 6,6 \\ \\ \frac{20 + 66 + 7x + 40 + 18}{22 + x} = 6,6 \\ \\ 144 + 7x = 6,6(22 + x) \\ 144 + 7x = 145,2 + 6,6x \\ 7x - 6,6x = 145,2 - 144 \\ 0,4x = 1.2 \\ x = \frac{1,2}{0,4} \\ x = 3[/tex]
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x = frekuensi nilai 7
[tex] \frac{nilai(frekuensi)}{frekuensi} = rata - rata \\ \\ \frac{5(4) + 6(11) + 7x + 8(5) + 9(2)}{4 + 11 + x + 5 + 2} = 6,6 \\ \\ \frac{20 + 66 + 7x + 40 + 18}{22 + x} = 6,6 \\ \\ 144 + 7x = 6,6(22 + x) \\ 144 + 7x = 145,2 + 6,6x \\ 7x - 6,6x = 145,2 - 144 \\ 0,4x = 1.2 \\ x = \frac{1,2}{0,4} \\ x = 3[/tex]