Discussion
Considering all three years, approximately what percentage of students were placed in the General Management Sector ?
Answer: B
About 21 per cent were placed in General Management.
General Management took 12% of 800 in 2015, 25% of 1000 in 2016 and 24% of 1200 in 2017:
\[ \begin{aligned} 96 + 250 + 288 &= 634 \\ 800 + 1000 + 1200 &= 3000 \\ 634 / 3000 &\approx 21.1\% \end{aligned} \]
The trap is to average the three percentages directly, (12 + 25 + 24)/3 = 20.3%, which ignores that the years had different numbers of students. 24 and 26 are too high, and 19 too low.
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