Jawaban: D. 8
[tex]mean = \frac{jumlah \: data}{banyaknya\:data } \\ 7 = \frac{(5 \times 4) + (6 \times p) + (7 \times 14) + (8 \times 12) + (9 \times 2)}{4 + p + 14 + 12 + 2} \\ 7 = \frac{20 + 6p + 98 + 96 + 15}{32 + p} \\ 7(32 + p) = 232 + 6p \\ 224 + 7p = 232 + 6p \\ 7p - 6p = 232 - 224 \\ p = 8[/tex]
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Jawaban: D. 8
[tex]mean = \frac{jumlah \: data}{banyaknya\:data } \\ 7 = \frac{(5 \times 4) + (6 \times p) + (7 \times 14) + (8 \times 12) + (9 \times 2)}{4 + p + 14 + 12 + 2} \\ 7 = \frac{20 + 6p + 98 + 96 + 15}{32 + p} \\ 7(32 + p) = 232 + 6p \\ 224 + 7p = 232 + 6p \\ 7p - 6p = 232 - 224 \\ p = 8[/tex]