# How to create a cumulative frequency polygon in excel

### How do you construct a frequency polygon?

**Steps to**

**Draw**a**Frequency Polygon**- Mark all the class marks on the horizontal axis. It is also known as the mid-value of every class.
- Corresponding to each class mark,
**plot**the**frequency**as given to you. - Join all the plotted points using a line segment.
- This resulting curve is called the
**frequency polygon**.

### How do you construct a frequency polygon from a frequency table?

To

**create a frequency polygon**, start just as for histograms, by choosing a class interval. Then**draw**an X-axis representing the values of the scores in your data. Mark the middle of each class interval with a tick mark, and label it with the middle value represented by the class.### What is the use of frequency polygon?

**Frequency polygons**are a graphical device for understanding the shapes of distributions. They serve the same

**purpose**as histograms, but are especially helpful in comparing multiple sets of data.

### What is the difference between histogram and frequency polygon?

Whereas a

**histogram**is built of bins**with a**width representing the interval, and a height representing the quantity of data points in each interval, a**frequency polygon**is constructed by drawing a point to represent the**frequency**of a particular interval and connecting that point to the one representing the**frequency**### What is difference between frequency and frequency polygon?

The only

**difference between**a**frequency**curve and a**frequency polygon**is that:**Frequency polygon**is drawn by joining points by a straight line.**Frequency**curve is drawn by a smooth hand. When**frequency polygon**is smoothed out then it is known as**frequency**curve.### What are the features of frequency polygon?

A

**frequency polygon**is a graph constructed by using lines to join the midpoints of each interval, or bin. The heights of the points represent the**frequencies**. A**frequency polygon**can be created from the histogram or by calculating the midpoints of the bins from the**frequency**distribution table.### Is a frequency polygon a line graph?

A

**frequency polygon**is a**line graph**of class**frequency**plotted against class midpoint.### How do you read a frequency polygon?

Draw the Y-axis to indicate the

**frequency**of each class. Place a point in the middle of each class interval at the height corresponding to its**frequency**. Finally, connect the points. You should include one class interval below the lowest value in your data and one above the highest value.### What does a frequency polygon look like?

A

**frequency polygon**is very**similar**to a histogram. In fact, they are almost identical except that**frequency polygons**can be used to compare sets of data or to display a cumulative**frequency**distribution. In addition, histograms tend to be rectangles while a**frequency polygon**resembles a line graph.### What is class interval?

**Class interval**refers to the numerical width of any

**class**in a particular distribution. Mathematically it is defined as the difference between the upper-

**class**limit and the lower

**class**limit. In statistics, the data is arranged into different

**classes**and the width of such

**classes**is called a

**class interval**.

### What is class interval formula?

**Class Interval**= Upper-

**Class**limit – Lower

**class**limit. In statistics, the data is arranged into different

**classes**and the width of such

**class**is called

**class interval**.

### What is class interval example?

The range of each group of data.

**Example**: you measure the length of leaves on a rose bush. Some are less than 1 cm, and the longest is 9 cm.### What is class interval in grouped data?

The

**data**is**grouped**into**class intervals**if the frequency table becomes too large to help us organise, interpret and analyse the**data**. The frequency of a**class interval**is the number of**data**values that fall in the range specified by the**interval**. The size of the**class interval**is often selected as 5, 10, 15 or 20 etc.### What is class size and class interval?

Answer:

**Class size**: The difference between the upper**class**limit and lower**class**limit is called the**class size**or**class**width.**Class interval**is the**size**of each**class**into which a range of a variable is divided, as represented by the divisions of a histogram or bar chart.### What is Class Mark formula?

**Class mark**= (Upper limit + Lower limit ) / 2.

**Class**size:

**Class**size is defined as the difference between the true upper limit and true lower limit of a

**class**interval.

### What is the formula of class size?

=> Difference between the true upper limit and true lower limit of a

**class**interval is called the**Class Size**.**Class size**remains the same for all**class**intervals.### What is the size of class interval?

The

**size**, or width, of a**class interval**is the difference between the lower and upper**class**boundaries and is also referred to as the**class**width,**class size**, or**class**length. If all**class intervals**of a frequency distribution have equal widths,…### How do you calculate the number of classes?

### What is the class frequency?

**Class frequency**refers to the number of observations in each

**class**; n represents the total number of observations in the entire data set. For the supermarket example, the total number of observations is 200. The relative

**frequency**may be expressed as a proportion (fraction) of the total or as a percentage of the total.

### How do you find the interval?

To find the increasing

**intervals**of a given function, one must determine the**intervals**where the function has a positive first derivative. To find these**intervals**, first find the critical values, or the points at which the first derivative of the function is equal to zero.