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nilai frekuensi= 20,40,70,a,10
ditanya= nilai a?
dijawab=
20x4=80
40x5=200
70x6=420
8xa=8a
10x10=100
=80+200+420+100=800
20+40+70+10=140
800:140=5,7
8xn=5,7 , n=5
800+40=840:140=6
jadi nilai a sama dengan 5,