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WAEC Mathematics 2010 Paper

Question : 37

Total: 49

Solution:

Concept:

The required percentage is the number of students who scored between 35 and 50, divided by the total number of students, then multiplied by 100.

Explanation:

From the bar chart, the frequencies for the required mark range are 35, 40 and 45.

Total frequency

= 20 + 35 + 40 + 45 + 25 + 15 = 180

Required number of students

= 35 + 40 + 45 = 120

So, percentage

= \frac{120}{180} \times 100\%

This simplifies to

\frac{2}{3} \times 100\% = 66\frac{2}{3}\%

Answer:

Option D:

66\frac{2}{3}\%

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