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SD =
=
9 9
=( xi - rata2 )^2 = (6-3)''+(6-4)''+(6-4)''+(6-5)''+(6-6)''+(6-6)''-(6-8)''+(6-9)''+(6-9)'' = 9+4+4+1+0+0+4+9+9 = 40
xi - rata'' = 40 = 20
6 6 3