WAEC Mathematics 2012 Paper

Concept:The median is the middle value when all the marks are arranged in ascending order.Explanation:Add up all the frequencies from the bar chart to find the total number of students.Total frequency, $N = 25$.Since $N$ is odd, the median is the $\left(\frac{N+1}{2}\right)$th term.Median position $= \left(\frac{25+1}{2}\right)$th $= 13$th term.When the $25$ marks are arranged in order, the $13$th mark is the required median.From the bar chart, counting the frequencies gives the cumulative frequency that reaches the $13$th position at mark $2$.Hence, the median of the distribution is $2$.Answer:Option A: $2$