Question 1

What is a weighted mean and how is it calculated?

Accepted Answer

A weighted mean (weighted average) accounts for the importance of each value. It's calculated as: Sum of (Value × Weight) ÷ Sum of Weights. Values with higher weights have more influence on the result. This is different from a simple average where all values are treated equally.

Question 2

When should I use weighted mean instead of regular average?

Accepted Answer

Use weighted mean when items have different importance or sample sizes. Examples: course grades with different credit hours, survey responses with different respondent weights, prices weighted by quantities sold. If all items are equally important, use a regular average.

Question 3

What if my weights don't sum to 100%?

Accepted Answer

The calculator works with any weight distribution. If weights don't sum to 100%, you can choose to normalize them (automatically adjust to sum to 100%) or use them as-is. The calculator shows whether weights have been normalized.

Question 4

Can I import data from a CSV file?

Accepted Answer

Yes! Import values and weights from CSV files. Format your CSV with columns for value and weight. The calculator automatically imports and calculates the weighted mean. Perfect for bulk calculations or data analysis.

Question 5

How do I interpret the contribution breakdown?

Accepted Answer

The contribution breakdown shows how each item contributes to the final weighted mean. Items with higher values and weights contribute more. Use this to understand which data points have the most influence on your result and identify outliers or important factors.

Weighted Mean Calculator with Import

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