Number of Packets | Number of Students \[({{f}_{i}})\] | Class mark \[{{y}_{i}}\] | \[{{d}_{i}}={{y}_{i}}-a\] | \[{{f}_{i}}{{d}_{i}}\] |
50 - 60 | f' | - 60 | ||
60 - 70 | f" | |||
70 - 80 | 5 | 0 | ||
80 - 90 | 2f' | |||
90 - 100 | f" - 2 |
A) 56
B) 66
C) 78
D) 76
Correct Answer: D
Solution :
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