Introduction

Class A scores: $12$, $14$, $15$, $15$, $90$ Class B scores: $18$, $19$, $20$, $21$, $22$

The mean for Class A is dragged up by one high score. The median tells a fairer story of a “typical” result. Descriptive statistics chooses the right summary so you can compare data sets honestly.

Data without summaries is noise.

You will organise data, compute mean, median, mode and range, read charts, and compare data sets using both averages and spread.