Class interval | Frequency |
0 - 20 | 7 |
20 - 40 | 11 |
40 - 60 | 10 |
60 - 80 | f |
80 - 100 | 13 |
A) 6
B) 7
C) 8
D) 9
E) None of these
Correct Answer: D
Solution :
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