tentukan varian ( ragam ) dari data tunggal 7,2,3,8,4,6?
Jawaban
Mean/ rata-rata = (7+2+3+8+4+6) : 6 = 30 : 6
= 5
Ragam/ Varians (S²) S²= (7-5)² + (2-5)² + (3-5)² + (8-5)² + (4-5)² + (6-5)² / 6 S²= (2)² + (-3)² + (-2)² + (3)² + (-1)² + (1)² / 6 S²= (4+9+4+9+1+1) / 6 S²= 28 / 6
S²= 4,67
