Mathematics for IGCSE & O level - Statistical Diagrams (Section 2 - No. 1)
Based on the key points regarding cumulative frequency diagrams, what is true?
Cumulative frequencies are plotted at the upper value of each group.
Points on a cumulative frequency diagram are joined by a curve.
The median of the data is the 25th percentile.
The interquartile range is the upper quartile minus the lower quartile.
Forklaring
The key points state: 'Cumulative frequencies are plotted at the upper value of each group. Points on a cumulative frequency diagram are joined by a curve. The interquartile range = upper quartile-lower quartile.' The median is the 50th percentile.