MathematicsChapter 12: Basic Statistics
Ogive Readings
Mark n/4 on the CF axis, go across to the curve, down to x: that x is Q1.
Learning objectives
- Define and explain ogive readings.
- Apply ogive readings to a focused FBISE question.
- Check the answer for correct terms, evidence, working, and units.
Definition
Mark n/4 on the CF axis, go across to the curve, down to x: that x is Q1. Median uses n/2. Q3 uses 3n/4. IQR = Q3 - Q1.
Formula
IQR = Q3 - Q1.
Where / symbols
- Ogive Readings
- Mark n/4 on the CF axis, go across to the curve, down to x: that x is Q1. Median uses n/2. Q3 uses 3n/4. IQR = Q3 - Q1.
Overview
Learn the idea, then use it:
Core Understanding
Mark n/4 on the CF axis, go across to the curve, down to x: that x is Q1. Median uses n/2. Q3 uses 3n/4. IQR = Q3 - Q1.
Examples n/4, n/2, 3n/4 · running total · ogive vs upper boundaries · OGIVE READINGS: Mark n/4 on the CF axis, go across to the curve, down to x: that x is Q1. Median uses n/2. Q3 uses 3n/4. IQR = Q3 - Q1.
Exam Application
State the correct term, connect it to the chapter rule or evidence, and use a clear example or calculation.
Examples Define first · Show the rule or evidence · Check units, labels, and conclusion
WHAT — OGIVE READINGS
Mark n/4 on the CF axis, go across to the curve, down to x: that x is Q1. Median uses n/2. Q3 uses 3n/4. IQR = Q3 - Q1.
HOW — Use the idea
Identify what is given, select this topic's rule or evidence, apply it one step at a time, and check the result.
In simple words
Do not merge ogive readings with a neighbouring idea that uses a different definition, rule, or method.
Key points
- n/4, n/2, 3n/4
- running total
- ogive vs upper boundaries
Exam preparation
Exam Focus
Quick revision
Revision Zone
Review the key facts, formulas and checks before you move on.Ogive Readings
Sticky Notes · Quick Revision
Core Idea
- Mark n/4 on the CF axis, go across to the curve, down to x: that x is Q1.
Key Points
- n/4, n/2, 3n/4
- running total
- ogive vs upper boundaries
Simple Check
- Explain ogive readings in your own words and connect it to one chapter example.
How to Answer
- Define the idea, show the main rule or evidence, apply it, and check the final statement.
Common Mistake
- Do not merge ogive readings with a neighbouring idea that uses a different definition, rule, or method.
FBISE Exam Tip
- Use the exact term, show working where needed, and include units or labelled evidence.
60-second revision
- Mark n/4 on the CF axis, go across to the curve, down to x: that x is Q1.
- n/4, n/2, 3n/4
- running total
- ogive vs upper boundaries
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