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Worked Examples · Example 5
Q.

Find the median of the following discrete series:

x1020304050
f461082
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Cumulative frequency table:

xxffc.f.
1044
20610
301020
40828
50230

N=30N=30 (even), so the median is the average of the 15th and 16th observations. From the c.f. column: observations 11 to 20 (which includes both the 15th and 16th) all take the value x=30x=30 (since c.f. reaches 20 exactly at x=30x=30, having been 10 at x=20x=20).

Median=15th value+16th value2=30+302=30\text{Median} = \frac{\text{15th value} + \text{16th value}}{2} = \frac{30+30}{2} = 30 …

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