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Verified answer
Mapel : MatematikaKelas : IX SMP
Bab : Statistika
Pembahasan :
Rata rata = 8,5
(A + B + C)/n = 8,5
(10 + B + 8)/3 = 8,5
18 + B = 25,5
Nilai B = 7,5
10 + B + 8 : 3 = 8,5
18 + B = 8,5 x 3
18 + B = 25,5
B = 25,5 - 18
B = 7,5