Mean
The arithmetic average of a set of values, calculated by summing all values and dividing by the number of values. Denoted as x̄ for a sample or μ for a population.
Real World
The Office for National Statistics calculates the mean average weekly earnings across UK workers each month — in 2025 it was around £682 — to track whether pay is keeping up with inflation.
Exam Focus
State whether the mean is appropriate by checking for outliers; if skewed data, explain why the median may be preferred.
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