There's a difference between median and mean. While both can be called "average", that term almost always means "mean".
If there are 9 employees making $30K/year and the owner makes $270K/year, then the average salary is $54K/year, but 9 of the 10 people are making below average.
Bill Gates made, what, $10 billion last year? Put him in a city with 100,000 people making $100,000/year. His arrival would cause the average salary to double, and all but one would have a less than average income.
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There's a difference between median and mean. While both can be called "average", that term almost always means "mean".
If there are 9 employees making $30K/year and the owner makes $270K/year, then the average salary is $54K/year, but 9 of the 10 people are making below average.
Bill Gates made, what, $10 billion last year? Put him in a city with 100,000 people making $100,000/year. His arrival would cause the average salary to double, and all but one would have a less than average income.