A) \[\frac{\sum\limits_{i=1}^{n}{{{y}_{i}}}}{n}\]
B) \[\frac{\sum\limits_{i=1}^{n}{{{y}_{i}}}}{\sum\limits_{i=1}^{n}{i}}\]
C) \[\frac{\sum\limits_{i=1}^{n}{{{y}_{i}}{{f}_{i}}}}{n}\]
D) \[\frac{\sum\limits_{i=1}^{n}{{{y}_{i}}{{f}_{i}}}}{\sum\limits_{i=1}^{n}{{{f}_{i}}}}\]
Correct Answer: A
Solution :
It is obvious.
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