1.

If n∑i=1(xi−a) and n∑i=1(xi−a)2=na,(n,a>1) then the standard deviation of n observations x1,x2,⋯,xn is :

Answer»

If ni=1(xia) and ni=1(xia)2=na,(n,a>1) then the standard deviation of n observations x1,x2,,xn is :



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