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Answer: The very first step is the preparation of cumulative frequency:
Marks | Students | Cumulative frequency |
0 – 10 | 5 | 5 |
10 – 30 | 15 | 5 + 15 = 20 |
30 – 60 | 30 | 20 + 30 = 50 |
60 – 80 | 8 | 50 + 8 = 58 |
80 – 90 | 2 | 58 + 2 = 60 |
N = 60
∴ n = 60/2 = 30
C.f greater than 30 is 50
Median class = 30 – 60
- l = 30
- c.f = 30
- F= 20
- h = 30
Median =l+[n2-cf]×h =30+30-2030×30 =30+1030×30 =30+10 Median =40
