Descriptive Statisticsmedium
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A frequency distribution shows class intervals and frequencies:

| Class Interval | Frequency | |---|---| | 10–20 | 4 | | 20–30 | 10 | | 30–40 | 14 | | 40–50 | 8 | | 50–60 | 4 |

The median class is the interval containing the median. Which class interval is the median class?