Question: Given i.i.d. X1, ..., Xn ~ N(u, o') where u is known, what is the MLE of o'? Is it biased

Given i.i.d. X1, ..., Xn ~ N(u, o') where u is

Given i.i.d. X1, ..., Xn ~ N(u, o') where u is known, what is the MLE of o'? Is it biased

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