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5,5,6,7,7,8,8,9,9
lalu dicari rata2nya
X=5+5+6+7+7+8+8+9+9/9
X=7,1
S=√(Xi-X)^2/n
S=√(5-7,1)^2+(5-7,1)^2+(6-7,1)^2+(7-7,1)^2+(7-7,1)^2+(8-7,1)^2+(8-7,1)^2+(9-7,1)^2+(9-7,1)^2/9
S=√4,41+4,41+1,21+0,01+0,01+1,21+1,21+3,61+3,61/9
S=√2,2
S=1,5