Percentiles
Number memory: how do you compare?
Median 7 adults · classic lab studies
Digit span: the longest string of digits you can repeat back after one look. Classic studies put the average at about seven, give or take two (Miller, 1956). Bell curve from that.
adults · classic lab studies
| Percentile | Number memory |
|---|---|
| 5th percentile | 4 digits |
| 10th percentile | 4 digits |
| 25th percentile | 6 digits |
| 50th percentile | 7 digits |
| 75th percentile | 8 digits |
| 90th percentile | 10 digits |
| 95th percentile | 10 digits |
A bell curve fitted to published averages; every value is a modeled estimate.