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mean= -------------------------
7
=49/7
=7
s²=sigma (xi-mean)²
=(4-7)² + (5-7)² + (6-7)² + (8-7)² + (9-7)² + (7-7)² + (10-7)²
= 9+4+1+1+4+0+9
=28
s =√28
s =5,29