Course Content
Data Collection & Questionnaire Design
Data Collection & Questionnaire Design
Sampling: Concept, Process, and Techniques
Sampling: Concept, Process, and Techniques
0/2
Hypothesis Testing: Procedure
Hypothesis Testing: Procedure
0/2
Operations Management: Role and Scope
Operations Management: Role and Scope
0/3
Facility Location and Layout: Site Selection and Analysis, Layout Design and Process
Facility Location and Layout: Site Selection and Analysis, Layout Design and Process
Facility Location and Layout
Site Selection and Analysis, Layout Design and Process
0/3
Enterprise Resource Planning: ERP Modules, ERP Implementation
Enterprise Resource Planning: ERP Modules, ERP Implementation
Scheduling: Loading, Sequencing, and Monitoring
Scheduling: Loading, Sequencing, and Monitoring
0/6
Quality Management and Statistical Quality Control, Quality Circles, Total Quality Management – KAIZEN, Benchmarking, Six Sigma
Quality Management and Statistical Quality Control, Quality Circles, Total Quality Management – KAIZEN, Benchmarking, Six Sigma
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ISO 9000 Series Standards
ISO 9000 Series Standards
Unit VIII: Business Statistics and Operations Management

Frequency Polygon

A frequency polygon is a line graph that represents a frequency distribution. It connects midpoints of class intervals with straight lines.

Key Features of a Frequency Polygon:

✔ It is created by plotting points at class midpoints and connecting them.
✔ The x-axis represents class midpoints, and the y-axis represents frequency.
✔ Can be used to compare multiple distributions on the same graph.

Example: Frequency Polygon for Student Test Scores

Class Interval (Marks) Midpoint Frequency (f)
0 – 10 5 5
10 – 20 15 8
20 – 30 25 12
30 – 40 35 10
40 – 50 45 15

🔹 Graph Interpretation:

  • The highest peak represents the most frequent category.

  • A smooth curve can be drawn for better visualization.

  • It helps in comparison between datasets.