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a) nilai rata-rata= 79,5 >jumlah kan semua urutan angka nya lalu dibagi jumlah data angka nya
b) nilai modus = 90 >nilai yg banyak/sering keluar
c)nilai median= Me=1/2(x(20/2)+x(20/2+1)
=1/2(x10+x11)
=1/2(80+80)
=1/2(160)
=80
x= 1,5 + 4 + 3 + 2 + 10 + 3 / 30
x= 23,5 / 30 = 0,78
semoga bener