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The mean is the average value and the standard deviation is the variation from the mean value.
Residual point
it can mean a few things for one 15=15 means 15 is of the same value of 15 doing something harder would be 5 8ths is = to 0.625 they are of the same value it is kinda the same thing of 5+5=10 5+5 the value of that is 10 this is not the best answer i think you should google it gl
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