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I have a simple question. Please see the below screenshot : enter image description here

It is from a midterm exam from a university : https://cedar.buffalo.edu/~srihari/CSE555/exams/midterm-solution-2006.pdf My questions is how the means are postive ? I am asking because the class samples are all negative so I would expect that the mean is also negative ?

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It is a typo in the solution.

The author corrects it by correctly computing the Bayes discriminant in the next step.

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