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Find the median of the following data.

Class Interval 11-15 16-20 21-25 26-30 31-35 36-40
Frequency 3 5 9 12 7 4

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= 25.5 + 3/12 × 5 = 25.5 + 5/4

= 25.5 + 1.25 

= 26.75 

∴ Required Median = 26.75

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