In a class of 30 students, the marks scored in an examination are displayed in the histogram. What percentage of the student scored more than 40%?
 

  • A 14%
  • B 40%
  • C 46\(\frac{3}{4}\)%
  • D 53\(\frac{1}{3}\)%
jamb 1989mathematics

The correct answer is C. 46\(\frac{3}{4}\)%

This histogram is transferred into this frequency table
\(\begin{array}{c|c} Marks & 20 & 40 & 60 & 80 & 100 \\ \hline students & 9 & 7 & 6 & 6 & 2\end{array}\)
Students who scored more than 40 = 6 + 6 + 2 = 14
i.e. \(\frac{14}{30}\) x 100% = 46\(\frac{3}{4}\)%

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