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maka banyak siswa yang beratnya diatas rata rata adalah 11
berat badan = [(37 x 5) + (38 x 4)+(39 x 5) + (40 x 3)+(41 x 3)] : [5+4+5+3+3] kg
= [185 + 152 + 195 + 120 + 123] : 20
= 38,75 kg
jumlah siswa dgn.
brat badan diatas rta-rta = 5 + 3 + 3 = 11