Calculate the median from the following data:
Marks (less than)510152025303540No of Students4102030557795100
MarksNo of Students(f)C.f0−5445−1061010−15102015−201030(C.f)(L1)20−2525(f)55(Median Class)25−30227730−35189535−405100N =∑f=100
Median = N2=1002=50th item
50th item lies in the group 20-25
∴L1=20,C.f=30,f=25,i=5
Median = L1+N2−C.ff×i
=20+50−3025×5=24
Median = 24 Marks