GCSE Maths Master Bounds

GCSE Maths Master Bounds 19 pages PDF
This document offers a detailed guide to understanding and constructing Box Plots, which are effective visual summaries of a data set’s spread. These plots illustrate five key values: the minimum and maximum data points, along with the three quartiles ($Q1$, $Q2$, and $Q3$), representing the $25%$, $50%$ (median), and $75%$ marks of the ordered data. The text emphasizes that box plots reveal two measures of spread—the range and the more reliable Interquartile Range (IQR), which is the difference between $Q3$ and $Q1$ and encompasses the middle $50%$ of the data, making it less susceptible to outliers. Ultimately, the purpose of a box plot is to present a quick, informative overview of data distribution, although it does not provide the total number of individual data points.