Age (in years) | 0-20 | 20-40 | 40-60 | 60-80 | 80-100 | Total |
Number of people | 15 | 21 | 17 | 100 |
Marks | Frequency |
0-100 100-200 200-300 300-400 400-500 500-600 600-700 700-800 800-900 900-100 | 2 5 9 12 17 20 15 9 7 4 |
Answer:
Let assumed mean a = 50 and h = 20
?(1)
Mean
i.e.,
Adding (1) and (2) ?(2)
Putting the value of in
OR
C.I.
Mid-value
0-20
20-40
40-60
60-80
80-100
15
21
17
10
30
50
70
90
-2
-1
0
1
2
-30
0
34
Cumulative frequency just greater than is 65
and corresponding class is 500-600.
median
class is
Hence,
Median
Age
Frequency
Cumulative
frequency
0-100
100-200
200-300
300-400
400-500
500-600
600-700
700-800
800-900
900- 1000
2
5
9
12
17
20
15
9
7
4
2
7
16
28
45
65
80
89
96
100
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