Statistics (III)

Mathematics SSS 1 Third Term

WEEK 11

Statistics (III)

Performance Objectives

Students should be able to;

1. Construct frequency polygon from a grouped data
2. Interpret frequency polygon
3. Compute data in a frequency polygon graph

Frequency polygon

Content

The frequency polygon is obtained by joining the midpoints of the tops of the histogram rectangles with straight lines. Since the polygon is a closed figure, we take one interval below the lowest internal on the base axis. Then we join the ends of the polygon to the midpoints of the new intervals.

A frequency polygon is another graphical representation of a distribution. It is obtained in two ways.

1. By joining the midpoints of the tops of the rectangles in the histogram,
2. By plotting…