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n = 9
maka :
x bar = (2+2+2+3+3+4+4+8+8) / 9 = 36/9 = 4
S = √(2-4)²+(2-4)²+(2-4)²+(3-4)²+(3-4)²+(4-4)²+(4-4)²+(8-4)²+(8-4)²
n
= √4+4+4+1+1+0+0+16+16
9
= √46/9
= √5,11