Nilai 10 20 30 40 50 60 70 f(x) 3   2   2   4  x    4  2 jika rata-rata 41 berapa nila x ! bantu ya !! orang yang pertama kali jawab aku kasih jawaba

[tex]nilai_1[/tex] = 10, [tex]frekuensi_1[/tex] = 3
[tex]nilai_2[/tex] = 20, [tex]frekuensi_2[/tex] = 2
[tex]nilai_3[/tex] = 30, [tex]frekuensi_3[/tex] = 2
[tex]nilai_4[/tex] = 40, [tex]frekuensi_4[/tex] = 4
[tex]nilai_5[/tex] = 50, [tex]frekuensi_5[/tex] = x
[tex]nilai_6[/tex] = 60, [tex]frekuensi_6[/tex] = 4
[tex]nilai_7[/tex] = 70, [tex]frekuensi_7[/tex] = 2
rata-rata = 41

rata-rata = [tex]\frac{(nilai1)(f1) + (nilai2)(f2) + (nilai3)(f3) + (nilai4)(f4) + (nilai5)(f5) + (nilai6)(f6) + (nilai7)(f7)}{jumlah frekuensi}[/tex]
41 = [tex]\frac{(10)(3)+(20)(2)+(30)(2)+(40)(4)+(50)(x)+(60)(4)+(70)(2)}{3+2+2+4+x+4+2}[/tex]
41 = [tex]\frac{30+40+60+160+50x+240+140}{17+x}[/tex]
41 x (17 + x) = 670 + 50x
697 + 41x = 670 + 50x
50x - 41x = 697 - 670
9x = 27
x = 27 : 9
x = 3