Class | Frequency |
10-30 30-50 50-70 70-90 90-110 110-130 | 5 8 20 2 |
Total | 50 |
Answer:
Let
Using step deviation method,
Mean
(1)
Also,
Cl
10-30
30-50
50-70
70-90
90-110
110-130
20
40
60
80
100
120
5
8
20
2
-2
-1
0
1
2
3
-10
-8
0
20
6
50
+8
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