Given forecast errors of 6, 4, 0 and -2, what is the mean squared error? 14? 18.67? 16? 12? None of these? Can someone help me with this question?

Given forecast errors of 6, 4, 0 and -2, what is the mean squared error?

14?

18.67?

16?

12?

None of these?

Can someone help me with this question?

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