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UPSC NDA I 2011 Mathematics Paper

For the next two (2) items that follow:
The following table gives the continuous frequency distribution of a continuous variable X :

Class Interval	0-10	10-20	20-30	30-40	40-50
Frequency	5	10	20	5	10

Question : 69

Total: 120

What is the median of the above frequency distribution?

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