Discussion
The percentage of passing of students in examination for all the years 2012 to 2015 combined together is ..................... .
Answer: C
The combined pass percentage is 60.
Add the passes and the totals over all four years before dividing:
\[ \begin{aligned} \text{passed} &= 200 + 400 + 500 + 700 = 1800 \\ \text{total} &= 500 + 700 + 800 + 1000 = 3000 \\ \frac{1800}{3000} &= 60\% \end{aligned} \]
Averaging the four yearly rates instead gives about 57.4%, close to the 57.14 option, which is only 2013's rate. 70 is 2015's rate alone, and 50 has no basis in the data.
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