This exam tips covers Exam Tips for Grouped Data within Grouped Data for GCSE Mathematics. Revise Grouped Data in Statistics for GCSE Mathematics with 14 exam-style questions and 20 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 5 of 8 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Topic position
Section 5 of 8
Practice
14 questions
Recall
20 flashcards
💡 Exam Tips for Grouped Data
- Reading intervals: "150 ≤ h < 160" means 150 is included, 160 is not
- Midpoints: Always (lower boundary + upper boundary) ÷ 2
- Class width: Should be consistent across all intervals
- Modal class vs mode: We can only find the modal class, not the exact mode
- Estimated values: Remember to state that mean and median are estimates
- Units: Always include units in your final answers
- Show working: Always show your calculation steps for full marks
Keep building this topic
Read this section alongside the surrounding pages in Grouped Data. That gives you the full topic sequence instead of a single isolated revision point.
Practice Questions for Grouped Data
A frequency table uses the class intervals shown below. | Speed, s (mph) | Frequency | |---|---| | 0 < s ≤ 20 | 4 | | 20 < s ≤ 40 | 11 | | 40 < s ≤ 60 | 9 | | 60 < s ≤ 80 | 2 | A car travels at exactly 40 mph. Which class interval does this value belong to?
A teacher groups 30 students' test scores into four class intervals and calculates the estimated mean and estimated median. Explain why both the estimated mean and the estimated median from grouped data are only approximations of the true values. In your answer, refer to the assumptions made.
Quick Recall Flashcards
14 questions on Grouped Data — practise free
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