Study the following frequency polygon and answer the questions. Given a line graph showing the number of students passed in Higher Secondary Examination in a school over the years 2008 to 2013.
No. of students passed in 2011 = 170
No. of passed students in 2012 = 156
=> % decrease = $$\frac{170-156}{170} * 100 = 8.235 \%$$
= ~8.24%
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