What Does "Mean In Arithmetic" Mean?

The mean or the arithmetic mean is commonly known as "the average." The mean is the sum of all scores divided by the number of scores. The formula for calculating a mean is:
μ = ΣX/N

where μ: population mean and
N: the number of scores.

If the scores are derived from a sample, then M pertains to the mean and N refers to the sample size. The formula for M (Mean) is the same as above:
M = ΣX/N

The mean is a fine measure of central tendency for approximately symmetric distributions but can be ambiguous in distorted distributions, since it can be greatly prejudiced by scores in the tail. Therefore, other statistical tools like the median may be more informative for distributions such as family income or reaction time that are frequently very skewed