itu jawabannya yang benar C. 7 cuma saya butuh cara pengerjaannya
بِسْـــمِ اللَّهِ الرَّحْمَــنِ الرَّحِيْمِ
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[tex] \displaystyle \rm\bar{x} = \frac{\sum f_i \times x_i}{\sum f_i}[/tex]
[tex]7.2= \frac{(5 \times 2) + (6 \times 4) + (7 \times x) + (8 \times 6) + (9 \times 3)}{2 + 4 + x + 6 + 3} [/tex]
[tex]7.2 = \frac{10+ 24 +7x + 48 +27}{15 + x} [/tex]
[tex] \rm7.2 = \frac{109 + 7x}{15 + x} [/tex]
[tex] \rm7.2 (15 + x) = 109 + 7x[/tex]
[tex] \rm108 + 7.2x = 109 + 7x [/tex]
[tex] \rm7.2x - 7x = 109 - 108[/tex]
[tex] \rm0.2x = 1[/tex]
[tex] \rm x = 1 \div 0.2[/tex]
[tex] \rm x = 5[/tex]
[tex] \\ [/tex]
Sehingga diperoleh data berikut.
[tex]\boxed{\begin{array}{c|c|c|c|c|c} \tt nilai &5&6&7&8&9\\ {\_\_\_\_\_\_\_}&{\_\_\_}&{\_\_\_}&{\_\_\_}&{\_\_\_}& {\_\_\_} \\ \tt \\ \tt frekuensi&2&4&5&6&3 \\ \end{array}}[/tex]
Jumlah data = 2 + 4 + 5 +6 + 3 = 20 (genap)
[tex] \\ [/tex]
Frekuensi kumulatif data diatas
[tex]\boxed{\begin{array}{c|c|c|c|c|c } \tt Fk&2&6&11&17&20\end{array}}[/tex]
[tex]\\[/tex]
Maka, median data:
[tex]\rm Me= X_{\frac{n}{2}}[/tex]
[tex]\rm Me= X_{\frac{20}{2}}[/tex]
[tex]\rm Me= X_{10}[/tex]
[tex]\rm Me = 7[/tex]
Jawaban C
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وَاللَّهُ عَالَمُ بِاالصَّوَافَ
[answer.2.content]
