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Data:
3=1, 5=1, 7=2, 10=1
Rata-rata= (3+5+7+7+10)/5 = 6,4
Nilai - rata" = -3,4; -1,4; 1,4; 4,4
(Nilai-rata")^2 = 11,56 ; 1,96; 1,96; 19,36
Frekuensi x {(nilai-rata-rata)^2} = 11,56; 1,96; 3,92; 19,36
Ragam= 11,56+1,96+3,92+19,36/5
=7,36