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The following are the marks scored by the students in the Summative Assessment exam 

Class 0-10 10-20 20-30 30-40 40-50 50-60
No. of Students 2 7 15 `10 11 5

Calculate the median.

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Class 0-10 10-20 20-30 30-40 40-50 50-60
No. of Students 2 7 15 `10 11 5
Cummulative frequency (cf) 2 9 24 34 45 50

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