WAEC Mathematics 2016 Paper

Concept:The lower quartile is the value below which $25\%$ of the data lies.Explanation:From the cumulative frequency curve, the total frequency is $N = 600$.The lower quartile position is given by $\frac{1}{4}N = \frac{1}{4} \times 600 = 150$.Locate the $150$th term on the vertical cumulative frequency axis.Draw a horizontal line from $150$ to the curve, then drop vertically to the horizontal axis.Reading from the curve, this point corresponds to $19.0$.Answer:$19.0$