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Nilai 6 ---> 5
Nilai 7 ---> x
Nilai 8 ---> 4
Nilai 9 -----> 3
Nilai 10 ----> 1
Rata-rata = (5*1)+(6*5)+(7*x)+(8*4)+(9*3)+(10*1) / (1+5+x+4+3+1)
7,3 = 5+30+7x+32+27+10 / 14+x
7,3 = 104+7x / 21+x
7,3 (14+x) = 104+7x
102,2+7,3x= 104+7x
7,3x-7x= 104-102,2
0,3x= 1,8
x=1,8/0,3
x= 6 <----------- jawaban
"Mohon jadikan jawaban yg terbaik ya,,,, "