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Average of Three Numbers Flowchart


In this post, we will model a flowchart to find the average of three numbers. In general, the average of n numbers is computed as:



sum = Sum of n numbers

Here, to calculate the average of three numbers  n = 3


Let’s compute the average of the three numbers by hand. Let the three numbers be n1, n2, and n3.

For example, let’s assume the numbers are as follows:

n1= 31,

n2 = 43

n3 = 97.

In the first step, we need to compute the sum of the three numbers.

sum   =  31 + 43 + 97

= 171

In the second step, we need to compute the average of the three numbers.

Average = 171/ 3

= 57

IPO chart

IPO chart for the average of three numbers flowchart

Input Process Output
Three numbers n1,n2,n3 AverageOfThree = (n1 + n2 + n3)/3


Output displayed by the flowchart



RAPTOR Flowchart

We will prompt the user to enter three numbers. In the flow chart, we will compute the average of the user-entered numbers. In the end, will display the result i.e average of the three numbers.

Let the numbers are: n1, n2, and n3

We will store the average in the variable: averageOfThree

Prompt the user with the numbers.



Flowchart Output

Let’s execute a sample test case to test the output of the flowchart. The flowchart should be tested and the output should be validated for proper working.


Test Case Scenario Detailed Steps Test Data Expected Result Actual Result
Add three numbers. Launch Raptor.

Execute the flowchart.

Enter three numbers as input.






Run the flowchart and enter the three numbers.


We can see in the output in the MasterConsole window that the output is displayed.

Using Array

To compute the average for more numbers i.e n> 3 the disadvantage of this approach is to maintain n

variables to hold the numbers. i.e n1,n2,n3 …. n

We can use an array to hold the numbers. Arrays are used to hold the variables of the same data type.

To compute the average of more variables using an array:

Average of array elements

RAPTOR Tutorials

RAPTOR tutorials on this website can be found here:

Flowchart examples:

RAPTOR official website:

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