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KAli = 39 × 6,5
= 253,5
KAli = 40 × 6,56
= 262,4
Selisihkan = 262,4 - 253-5
nilai murid susulan = 8,9
Arigatou^^
39 x 6,5 = 253,5
n = 1 rata2 = a
1 x a = a
n = 40 rata2 = 6,56
40 x 6,56 = 262,4
253,5 + a = 262,4
a = 8,9
jadi nilai murid yang mengikuti ulangan susulan adalah 8,9