The graph above shows the cumulative frequency curve of the distribution of marks in a class test. What percentage of the students scored more than 20 marks...

Question 1 Report

The graph above shows the cumulative frequency curve of the distribution of marks in a class test. What percentage of the students scored more than 20 marks?

68%

28%

17%

8%

Answer Details

$\begin{matrix} class-marks(x) & (freq. (f) & cum. freq. \\ 9 & 3.....3 \\ 14 & 6....3 + 6 = 9 \\ 19 & 9.....9 + 9 = 18 \\ 24 & 3.....18 + 3 = 21 \\ 29 & 2.....21 + 2 = 23 \\ 34 & 2.....23 + 2 = 25 \\ 25 \end{matrix}$
% of students scoring more than 20 marks

= $\frac{7}{25}$ x 100% = 28%

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Percentages

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