Vocabulary · Free lesson
Data English: mean or median?
A product manager asks you to label a chart of five sessions. “Average time” leaves the intended measure unclear.
Professor Scott MendozaThe short answer
Mean is the arithmetic average: total divided by count. Median is the middle value after sorting; with an even count, average the two middle values. Say “The median duration for these five sessions was 4 minutes,” not “Everyone spent 4 minutes.”
Name the measure before interpreting it.
Our fictional durations are 2, 3, 4, 5 and 16 minutes. The total is 30, so the mean is 6 minutes. The sorted middle value is 4, so the median is 4 minutes. In a data discussion, mean is a noun naming a statistic; it does not mean “meaning.” Average often refers to the mean, but ask which measure the writer intends if the label is vague. Neither number says that every session lasted that long.
Compare the examples
The mean duration for these five sessions was 6 minutes.
The median duration for these five sessions was 4 minutes.
By average, do you mean the arithmetic mean or the median?
The mean can be a value that no individual observation has. None of these five sessions lasted 6 minutes.
Build the meaning step by step
Measure
the median duration
Group
for these five sessions
Value and unit
was 4 minutes
Try it now
Choose the accurate label
Read all answers and explanations
For 2, 3, 4, 5 and 16 minutes, the total is 30. Which is the mean?
6 minutes30 divided by five is 6.
The same sorted values have which median?
4 minutes4 is the middle of the five ordered observations.
Which statement preserves what the supplied median tells us?
The median duration for these five sessions was 4 minutes.Name the measure and observed group without claiming every value is identical.
Put it into practice
Repair a chart caption
The chart reports the median of these five durations: 2, 3, 4, 5 and 16 minutes.
Every user spends 4 minutes.
See a model answer
The median duration for these five sessions was 4 minutes.
The caption describes a supplied summary, not identical individual behavior.
A little more clarity
Common questions
A few useful details before you move on.
What if there are four values?
For the median, sort them and average the two middle values. For 2, 4, 8 and 10, the median is 6.
The median is (4 + 8) / 2 = 6.
Is median always better?
No. The useful measure depends on the question and data. Here your task is to label the given measure accurately.
This chart reports the median, not the mean.
Take it into your day
Keep the statistic, unit and group; do not turn a summary into an “everyone” claim.
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