Mathematics for IGCSE & O level - Statistical Diagrams (Section 5 - No. 8)

Which of the following statements about cumulative frequency diagrams is correct?

They are used to display discrete data.

The data is plotted using the lower bound of the class intervals.

They are used to estimate the median.

The graph always decreases.

Cumulative frequency diagrams are used to estimate the median by finding the value on the x-axis that corresponds to half the total frequency.