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data = 2,4,5,6, 8
X bar = (2+4+5+6+8)/5 = 25/5 = 5
S² = (2-5)²+(4-5)²+(5-5)²+(6-5)²+(8-5)²
n-1
= 9+1+0+1+9
5-1
= 20/4
= 5
S = √5