Question 1

What is the difference between mean, median, and mode?

Accepted Answer

Mean = sum/count; affected by outliers. Median = middle value; robust to outliers. Mode = most frequent value. For skewed data (like salaries), the median is usually the better 'average'.

Question 2

How do I calculate a weighted average?

Accepted Answer

Multiply each value by its weight, sum the products, then divide by the sum of weights. Example: Exam (weight 60, score 85) + Quiz (weight 40, score 90) → (60×85+40×90)/(60+40) = 87.

Question 3

What is a geometric mean used for?

Accepted Answer

The geometric mean is used when comparing things with exponential growth (investment returns, population growth). It's the nth root of the product of n values.

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