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The question is in the title. I'm mostly asking because I'm wondering whether this is subjective or not (this is regarding a sample like avg engineer salaries by state).
I know it's more appropriate to use the mean if the distribution is symmetric, or normal. But wouldn't all real life distributions be skewed, technically? What's a good rule of thumb here? When should I say, skewness value of $\pm \, x$ so the median is more representative of the average salary?