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
Which action best applies “Averages Can Hide Important Differences”?
- Ask: Which choice keeps the most valuable future paths open?
- Change the two most uncertain assumptions across plausible ranges and note where your preferred option switches.
- Look for the median and spread as well as the average. — correct
A single average may describe no typical person in a highly uneven group.