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5 5 6 6 7 8 8 9 9
X = (5+5+6+6+7+8+8+9+9) / 9
X = 63/9 = 7
jadi Ragam ( varians)
simbol ragam yaitu S²
langsung aja y
S²=
( 2(5-7)²+2(6-7)²+(7-7)²+2(8-7)²+2(9-7)² ) / 9
S²=
(8+2+0+2+8) / 9
S²= 20/9 = 2,22
jadi variansnya yaitu 2,22.
semoga berkah +_+