Chapter 15

Data and probability

Types of random variables, frequency and relative frequency tables, the mode and median, cumulative frequency, and grouped data with histograms and ogives.

Sections

15A Random variables and frequency tables Categorical, discrete and continuous variables, frequency and relative frequency tables, relative frequency as an estimate of probability, histograms and polygons, and the mode.
15B Cumulative frequency The median of a list and of a frequency table, cumulative and relative cumulative frequency, and cumulative frequency histograms and polygons.
15C Grouped data Grouping continuous and discrete data into classes, class centres, histograms and polygons for grouped data, and estimating the median from a cumulative frequency polygon.