Choose the correct alternative : [MCQ] f...

Choose the correct alternative : [MCQ] f `X-(mu, sigma^2)` then an unbiased estimator of `mu` is-

A

`sum_(i=1)^n x_i`

B

`1/nsum_(i=1)^n x_i`

C

`1/n^2 sum x_i`

D

`1/nsumX_i^2`

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