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Making Sense of Data Collections
Making Sense of Data Collections
Imagine you've surveyed 100 students about their favorite subjects. You get responses like: Maths, English, Science, Maths, English, Science, Maths, Science, Science, English... How do you make sense of this long list?
Frequency tables organize data by counting how many times each value appears. Instead of a confusing list, you get: Maths (28), English (35), Science (37). Much clearer!
What is frequency?: Frequency is the number of times each value or category appears in a dataset. It shows how often something occurs.
Mathematics glossary
- What is frequency?
- Frequency is the number of times each value or category appears in a dataset. It shows how often something occurs.
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Exam Tips for Frequency Tables
- Always check totals - frequency column should add up to total number of data values
- Use tally marks correctly - groups of 5 with the 5th mark crossing the first 4
- Choose appropriate class widths - usually 5, 10, or another round number
- Be careful with inequalities - understand ≤ and < symbols for grouped data
- Label clearly - include units and clear headings
- Modal class vs mode - modal class is a range, mode is a single value
- Show working - especially when calculating from frequency tables
Now try it yourself
Quiz · Question 1 of 11
The table below shows the number of books read by students in a month: | Books read | Frequency | |---|---| | 0 | 4 | | 1 | 7 | | 2 | 11 | | 3 | 6 | | 4 | 2 | What is the mode?
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