# Calculate Coefficient of Variation Using Python

## What is the coefficient of variation (CV) and how is it calculated?

The coefficient of variation (CV) is a statistical measure of the dispersion of data values. It is calculated by dividing the standard deviation of the dataset by the mean and multiplying by 100 to express it as a percentage. How can you modify the program, stats.py, to include a function that calculates and returns the CV?

## Calculation of Coefficient of Variation

The coefficient of variation (CV) is a statistical measure that indicates the level of variability in a dataset relative to the mean. It is calculated as the ratio of the standard deviation to the mean, multiplied by 100 to express it as a percentage. By modifying the program, stats.py, to include a function that calculates and returns the CV, you can enhance the statistical capabilities of the program.

To modify the program stats.py to include a function that calculates and returns the coefficient of variation (CV), you can follow these steps:

## Step 1: Open the stats.py file

Open the stats.py file in a text editor or Python IDE to access the code for modification.

## Step 2: Add the 'CV' function

Locate the existing functions in the program, such as mean, standard deviation, and median. Add a new function called 'CV' that takes the dataset as an input parameter.

## Step 3: Calculate the CV

Inside the 'CV' function, calculate the standard deviation of the dataset using the existing 'standard deviation' function. Calculate the mean of the dataset using the existing 'mean' function. Divide the standard deviation by the mean and multiply by 100 to get the coefficient of variation.

## Step 4: Return the CV value

Return the calculated coefficient of variation from the 'CV' function to be used in the main part of the program.

## Step 5: Print the CV value

In the main part of the program, after calculating the mean, standard deviation, and median, call the 'CV' function with the dataset as an argument. Print the calculated coefficient of variation along with the other statistics.

By following these steps and modifying the program as described, you will be able to calculate and print the coefficient of variation (CV) in addition to the mean, standard deviation, and median of the dataset.