MathematicsChapter 11: Basic Statistics
Finding H
Do not subtract upper limit from lower limit blindly if the classes are 1-10, 11-20: 10 - 1 = 9 would be the wrong width.
Learning objectives
- Define and explain finding h.
- Apply finding h to a focused FBISE question.
- Check the answer for correct terms, evidence, working, and units.
Definition
Do not subtract upper limit from lower limit blindly if the classes are 1-10, 11-20: 10 - 1 = 9 would be the wrong width. Subtract consecutive lower limits: 11 - 1 = 10, or 21 - 11 = 10. You can also subtract consecutive boundaries: 10.5 - 0.5 = 10. Equal-width tables keep the same h in every row. Unequal widths need a different h in each row (needed later for frequency density).
Where / symbols
- Finding H
- Do not subtract upper limit from lower limit blindly if the classes are 1-10, 11-20: 10 - 1 = 9 would be the wrong width. Subtract consecutive lower limits: 11 - 1 = 10, or 21 - 11 = 10. You can also subtract consecutive boundaries: 10.5 - 0.5 = 10. Equal-width tables keep the same h in every row. Unequal widths need a different h in each row (needed later for frequency density).
Overview
Learn the idea, then use it:
Core Understanding
Do not subtract upper limit from lower limit blindly if the classes are 1-10, 11-20: 10 - 1 = 9 would be the wrong width. Subtract consecutive lower limits: 11 - 1 = 10, or 21 - 11 = 10. You can also subtract consecutive boundaries: 10.5 - 0.5 = 10. Equal-width tables keep the same h in every row. Unequal widths need a different h in each row (needed later for frequency density).
Examples consecutive lower limits · wrong width · Class size h · FINDING h: Do not subtract upper limit from lower limit blindly if the classes are 1-10, 11-20: 10 - 1 = 9 would be the wrong width
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 — FINDING H
Do not subtract upper limit from lower limit blindly if the classes are 1-10, 11-20: 10 - 1 = 9 would be the wrong width. Subtract consecutive lower limits: 11 - 1 = 10, or 21 - 11 = 10. You can also subtract consecutive boundaries: 10.5 - 0.5 = 10. Equal-width tables keep the same h in every row. Unequal widths need a different h in each row (needed later for frequency density).
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 finding h with a neighbouring idea that uses a different definition, rule, or method.
Key points
- consecutive lower limits
- wrong width
- Class size h
Exam preparation
Exam Focus
Quick revision
Revision Zone
Review the key facts, formulas and checks before you move on.Finding H
Sticky Notes · Quick Revision
Core Idea
- Do not subtract upper limit from lower limit blindly if the classes are 1-10, 11-20: 10 - 1 = 9 would be the wrong width.
Key Points
- consecutive lower limits
- wrong width
- Class size h
Simple Check
- Explain finding h 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 finding h 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
- Do not subtract upper limit from lower limit blindly if the classes are 1-10, 11-20: 10 - 1 = 9 would be the wrong width.
- consecutive lower limits
- wrong width
- Class size h
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