Cumulative frequency, box plots and histograms

By the end you’ll be able to

• Draw cumulative frequency graphs (plotting at upper class boundaries) and read off the median, quartiles, interquartile range and percentiles (Higher)
• Draw and interpret box plots, and compare distributions using the median and interquartile range in context (Higher)
• Draw and interpret histograms with unequal class widths using frequency density = frequency ÷ class width (Higher)