Nilai 5 6 7 8 9 Frekeuensi 3 a 4 1 2 Jika data di atas memiliki mean 6,75 maka hitunglah nilai a

[tex]6.75 = \frac{5(3) + 6(a) + 7(4) + 8(1) + 9(2)}{3 + a + 4 + 1 + 2} \\ 6.75 = \frac{15 + 6a + 28 + 8 + 18}{10 + a} \\ 6.75 (10 + a) = 69 + 6a \\ 67.5 + 6.75a = 69 + 6a \\ 6.75a - 6a = 69 - 67.5 \\ 0.75a = 1.5 \\ a = 2[/tex]
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