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# Qwizdom year 9 maths - grouped frequency tables

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An interactive Maths lesson designed for use with Qwizdom Interactive voting systems.

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### Qwizdom year 9 maths - grouped frequency tables

1. 1. YEAR 9 MATHS: GROUPED FREQUENCY TABLES AN INTERACTIVE QWIZDOM LESSON
2. 5. What does ‘f’ mean? <ul><li>Midpoint </li></ul><ul><li>Frequency </li></ul><ul><li>Cumulative frequency </li></ul>
3. 7. What does Σ f mean? <ul><li>Frequency </li></ul><ul><li>Cumulative Frequency </li></ul><ul><li>Total Frequency </li></ul>
4. 8. What does ‘x’ mean? <ul><li>Midpoint </li></ul><ul><li>Cumulative Frequency </li></ul><ul><li>Multiply </li></ul>
5. 14. What have we just worked out? A- Estimated Mean B- Modal Class C- Class containing the median
6. 15. What does Σ f mean? <ul><li>Frequency </li></ul><ul><li>Cumulative Frequency </li></ul><ul><li>Total Frequency </li></ul>
7. 16. Which of these tells us that there are 25 people in total? <ul><li>fx=25 </li></ul><ul><li>f=25 </li></ul><ul><li>Σ f=25 </li></ul>
8. 17. If there are 25 people in total. Which one is the middle one? (number of people + 1) 2
9. 19. Which is the modal class?
10. 23. Which class contains the median? (Our middle number was 13)
11. 24. What does Σ f mean? <ul><li>Total Frequency </li></ul><ul><li>Cumulative Frequency </li></ul><ul><li>Frequency </li></ul>