CORE_MATH • SHS 1Term 3WAEC / WASSCE SyllabusVIP Lesson
Statistics I: Data Collection, Presentation & Frequency Tables
Discrete and continuous data, tally charts, frequency distribution tables, bar charts, pie charts, and mean, median, mode of ungrouped data.
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Real-World Context & Relevance in Ghana
Ghana Statistical Service (GSS) compiles national census and consumer price index (CPI) figures using frequency distribution and statistical visualization methods.
Key Syllabus Learning Objectives
- 1Distinguish between discrete and continuous variables
- 2Construct tally charts and frequency distribution tables from raw data
- 3Calculate sector angles and construct accurate pie charts using protractor
- 4Calculate mean, median, and mode from ungrouped frequency tables
1
Pie Chart Construction Protocol
In WAEC examinations, drawing a pie chart requires: (1) calculating each sector angle to the nearest whole degree; (2) verifying angles sum to exactly 360°; (3) drawing a neat circle with a compass; (4) measuring angles carefully with a protractor; (5) labeling each sector clearly.
- Sector angle = (f / ∑f) × 360°.
- Table of angles must be shown clearly before drawing.
- Label sectors with category names and angles/percentages.
- Use compass and protractor (never freehand!).
Core Takeaway:
Always show the sector angle calculation table before drawing the circle.
WAEC / WASSCE Examiner Tips
- Always draw pie charts with a compass and measure angles accurately with a protractor (WAEC allows ±1° tolerance).
- In bar charts, leave equal gaps between bars (unlike histograms where bars touch).
- Show the ∑fx and ∑f column totals clearly at the foot of your frequency table.
Common Candidate Pitfalls & Errors to Avoid
- Drawing touching bars for discrete bar charts (which confuses bar charts with histograms).
- Angle calculations not summing to 360° due to premature rounding.
- Confusing the frequency column with the data values when finding the median.
Topic Mastery Checklist
- Can I construct a frequency distribution table with an fx column?
- Can I calculate sector angles for a pie chart?
- Can I find the median from a cumulative frequency column?
Test Your Knowledge
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10 WAEC-standard multiple choice questions with instant explanations.
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