Explain the term cumulative frequency and state how the cumulative frequency of a class is obtained.

The marks of 40 students are grouped into class intervals of width 10. Explain how the modal class is identified from a histogram of the data.

Why must class intervals be converted to their exclusive form before a histogram is drawn?

State two differences between a bar graph and a histogram.

What is an ogive, and what is read from the point where the two ogives of a distribution intersect?

A less-than ogive is drawn for 60 observations. Explain how the median, the lower quartile and the upper quartile are read from it.

For a distribution of 80 observations, state the cumulative frequencies at which the median, the lower quartile, the upper quartile and the 60th percentile are read from a less-than ogive.