In more detail
For 2, 4, 4, 4, 5, 5, 7, 9 the mean is 5, the median is 4.5 (average of the two middle values) and the mode is 4. Outliers pull the mean but not the median, so incomes and house prices are quoted as medians.
Glossary
Math & Statistics
Mean, median and mode
The mean is the sum divided by the count, the median is the middle value when sorted, and the mode is the most frequent value.
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See also
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Glossary
Standard deviation
Standard deviation measures how far values typically stray from their mean; it is the square root of the variance.
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Glossary
Weighted average
A weighted average gives each value a weight so that more important values count for more: `Σ(weight × value) / Σweight`.