by average we mean any measure of central tendency and mean is one of the averages.
other measures of average are median ,mode, geomatric mean and harmonic mean.
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The average or mean is one measure of central tendency. There are several.
nothing they are both the same
The mean is the average value and the standard deviation is the variation from the mean value.
the mean is the average of all the salaries an the the median is the number that falls in the middle
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.