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∑x = 65.n, n = jumlah siswa = 11
∑x = 65.11
∑x = 715
jika tertinggi dan terendah dikeluarkan maka rata2 = 63
(∑x - (a+b))/(11-2) = 63
715 - (a+b) = 567
a+b = 148, anggap a tertinggi dan b terendah
a+b = 148
a- b = 20 (+)
2a = 168
a = 84, nilai tertinggi adalah 84