In this deck, you'll learn how to organise raw data to make it easier to understand. We'll cover tally charts, frequency tables, and two-way tables, which are essential skills for handling statistics in GCSE Maths.

When you first collect data, like the results of a survey, it's often just a long, messy list. This is called raw data. To make sense of it, our first step is often to create a tally chart to count how many times each value appears.

To make a tally, you draw a vertical line for each item you count. When you get to the fifth item in a group, you draw a diagonal line across the first four. This creates a 'gate' shape, making it easy to count in fives.

After you've finished tallying, the next step is to create a frequency table. 'Frequency' is just a mathematical word that means 'how many' or 'how often' something occurs. The frequency table neatly summarises the counts from your tally chart.