Think Better · 55 sec
Averages Can Hide Important Differences
Two groups can share the same average and still be very different.
The useful idea
- Understand
The mean compresses all observations into one central number.
- Connect
Groups with the same mean can have different medians, ranges, clusters, and extreme values.
- Apply
The distribution often matters when judging income, performance, waiting time, or unequal outcomes.
Why this matters
A single average may describe no typical person in a highly uneven group.
Try this
Look for the median and spread as well as the average.
Test your recall
What is the most useful next step for “Averages Can Hide Important Differences”?
- Look for the median and spread as well as the average. — correct
- Act immediately without checking context.
- Assume the first impression is complete.
A single average may describe no typical person in a highly uneven group.