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Let f(x)=Sigma(i=1)^(n) (x-xi)^2, where ...

Let `f(x)=Sigma_(i=1)^(n) (x-x_i)^2`, where `x_i` are real coefficients , then which of the following is/are incorrect ?

A

f(x) attains its least value at `x=1/n underset(i=1)overset(n)Sigmax_i`

B

f(x) attains its least value of `x=(x_1+2x_2+3x_3+.....+nx_n)/n`

C

f(x) attains its least value of `x=n underset(i=1)overset(n)Sigmax_i`

D

f(x) attains its least value at `x=underset(i=1)overset(n)Sigmax_i`

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B,C,D
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