4. Let X1, X2, ..., X, be a random sample from a normal distribution with known mean H, unknown variance o? and density function 1 fx(x) I ER. Using the log-likelihood, find the maximum likelihood estimator for o?. If the mean is H = 3 and the sample is {r1, 12, 13} = {{-1,2,0.5, 1.5}, what is the estimate for o?

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