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Rata-rata = ( jumlah semua nilai / ( banyak nilai)= (4.2 + 5.4 + 6.4 +7.x + 8.2 + 9.3) /(2+4+4+x+2+3)
= (8+20+24+7 x + 16 + 27) /(15+x)
= (95 + 7x) / (15+ x) = 6,5
95 +7x = 97,5 + 6,5x
0,5x = 2,5
x = 5
Murid di atas rata-rata adalah bernilai lebih dari 6,5
= 5 + 2 + 3
= 10 orang