plz help me answer this question

Answers
Answer:
Step-by-step explanation:
marks number of students
20 - 30 4
30 - 40 4 + 10 =14
40 - 50 14 + 12 = 26
50 - 60 26 + 14 = 40
60 - 70 40 + 8 = 48
70 - 80 48 + 3 = 51
80 - 90 51 + 4 = 55
90 - 100 55 + 5 = 60
total frequency = 60
so,
N = 60
median = N/2
= 60/2
= 30