###### Asked in Math and ArithmeticStatisticsGeometry

Math and Arithmetic

Statistics

Geometry

# What is frequency polygon?

## Answer

###### Wiki User

###### July 27, 2012 10:41AM

A frequency polygon is a simple way of representing quantitative data. It is usually used for ungrouped data (a histogram is more commonly used for grouped data).

It is a plot of points whose x-coordinate represents values that are observed and the y-coordinate is a count of the number of times the value was observed. These points are joined together using straight lines to form the frequency polygon.

Often the first point is joined to a point on the x-axis that is one unit before the x-coord of the first point, and the last point is joined to a point on the x-axis that is one unit after the x-coord of the last point to complete the polygon.

## Related Questions

###### Asked in Math and Arithmetic, Statistics, Geometry, Plural Nouns

### How is a frequency curve in statistics different from a frequency polygon?

In order to plot the points on either the frequency polygon or
curve, the mid values of the class intervals of the distribution
are calculated. Then the frequencies with respect to the mid points
are plotted. However in a frequency curve the points are joined by
a smooth curve, where as in a frequency polygon the points are
joined by straight lines. Apart from this major difference, a
frequency polygon is a closed figure where as the frequency curve
is not.

###### Asked in Statistics, Geometry

### How do you form a frequency polygon from a frequency diagram?

Identify the midpoint of the top of each bar of the frequency
diagram. Join these together and they will form a frequency
polygon. Sometimes the polygon is extended down to the horizontal
axis to where the midpoints of the bar before the first bar would
have been and where the bar after the last bar would have been.

###### Asked in Statistics

### What are frequency Polygon?

###### Asked in Graphs

### Difference between histogram and frequency polygon?

They are the same thing except that in a histogram you are using
bars (like in a bar chart) to show the frequency, while a polygon
uses points connected by straight lines
The way I have the students do it is to plot the x,y coordinates
for your data ( x is the value of the random variable, y is the
frequency )
If you are doing a frequency polygon, you just connect the dots
with straight lines (you need to start at zero to the left of your
first point and to the right of your last point)
If you are doing a histogram, just draw bars where the middle of
each bar comes up to the x,y point