What an eight-hour average leaves out
Both of these invented five-day weeks total 40 scheduled hours. Each averages eight hours a day. Would either one fit your calendar equally well? Look at the daily breakdown before deciding.
The same average
Mean scheduled hours per day
Both bars use the same scale, from zero to 16 hours.
Look at the individual days
Week A has eight hours on every day. Week B has 3, 5, 8, 10 and 14 hours. Their means are both eight hours. Their medians are also both eight. Week B still has a 14-hour day.
| Day | Week A | Week B |
|---|---|---|
| Monday | 8 | 3 |
| Tuesday | 8 | 5 |
| Wednesday | 8 | 8 |
| Thursday | 8 | 10 |
| Friday | 8 | 14 |
| Total | 40 | 40 |
| Mean | 8 | 8 |
| Median | 8 | 8 |
| Range | 0 | 11 |
The range is the longest day minus the shortest: zero hours in Week A and 11 hours in Week B.
Ask the question your decision needs
Suppose your own calendar can fit no more than ten scheduled hours on any one day. Week A stays within that limit. Week B exceeds it on one day by four hours, despite the same weekly total. Ten hours is an invented calendar constraint, not a recommended working limit.
Before agreeing to a schedule, ask: What is the busiest day? How many days exceed my available time? Can those hours move? Which hours are fixed?
Copy this note
“The average is ___. The busiest day is ___. My daily limit is ___. The plan exceeds it on ___ days. I still need to check ___.”
These examples count scheduled hours only. Breaks, travel, intensity and personal needs can change the practical comparison.
Try another numbers experiment: Why Two Dice Don’t Give Every Total the Same Chance. Predict the results, count the 36 possible rolls, and compare them with a small experiment.