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=------------------------------------<per>
3+2+4+1
= 21+16+36+10
--------------------
10
=83/10
=8,3
_________
frekuensi: 3|2|4|1 jumlahkan semua frekuensi)10
__________
n×f: 21,16,36,10,340
= 340
___ = 34
10