The mean of discrete observations $y_1, y_2, \ldots, y_n$ is given by:
- A$\frac{\sum_{i=1}^n y_i}{n}$
- B$\frac{\sum_{i=1}^n y_i}{\sum_{i=1}^n i}$
- C$\frac{\sum_{i=1}^n y_i f_i}{n}$
- D$\frac{\sum_{i=1}^n y_i f_i}{\sum_{i=1}^n f_i}$
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