Nilai: 5, 6, 7, 8, 9 Frekuensi: 3, x, 4, 4, 2 Rata-Rata: 7 Maka nilai x .... a. 2 b. 3 c. 5 d. 7
Matematika
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Pertanyaan
Nilai: 5, 6, 7, 8, 9
Frekuensi: 3, x, 4, 4, 2
Rata-Rata: 7
Maka nilai x ....
a. 2 b. 3 c. 5 d. 7
Frekuensi: 3, x, 4, 4, 2
Rata-Rata: 7
Maka nilai x ....
a. 2 b. 3 c. 5 d. 7
1 Jawaban
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1. Jawaban cupid85
7 = { ( 3 × 5 ) + ( x × 6 ) + ( 4 × 7 ) + ( 4 × 8) + ( 2 × 9) } / ( 3 + x + 4 + 4 + 2 )
7 = ( 15 + 6x + 28 + 32 + 18 ) / ( 13 + x )
7 ( 13 + x ) = 93 + 6x
91 + 7x = 93 + 6x
7x - 6x = 93 - 91
x = 2 ( A )