| Marks | 10-20 | 30-30 | 30-40 | 40-50 | 50-60 | 60-70 |
| Frequency | 10 | 15 | 30 | 32 | 8 | 5 |
Answer:
(1)
Now, plot the points (20,10), (30, 25), (40, 55),
(50, 87), (60, 95), (70, 100).
Marks
Number of
students(f)
10-20
20-30
30-40
40-50
50-60
60-70
10
15
30
32
8
5
Total
Marks
Number of
students(f)
Less than
20
Less than 30
Less than 40
Less than 50
Less than 60
Less than 70
10
25
55
87
95
100
Total number of students =100
students
In order to find the median, we first locate the point corresponding
to 
student
on V-axis. Let the point be P from this point draw a line parallel to
the X-axis cutting the curve at Q. From this point Q, draw line parallel to Y-axis
and meeting .Y-axis at the point M
The X-axis coordinate of At is 383.
Hence, the required median is 38.3. (1)
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