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It would depend on the nature of each side. For example, if a side contained bracketed and not bracketed terms, then I would expand but, if not, I would not.
The mean is the average value and the standard deviation is the variation from the mean value.
Residual point
For a population the mean and the expected value are just two names for the same thing. For a sample the mean is the same as the average and no expected value exists.
mean: average