Enter the total variance and the mean of the set into the Calculator. The calculator will evaluate the Index of Dispersion.

## Index of Dispersion Formula

IOD = V / m

Variables:

- IOD is the Index of Dispersion ()
- V is the total variance
- m is the mean of the set

To calculate Index of Dispersion, divide the total variance by the mean of the set.

## How to Calculate Index of Dispersion?

The following steps outline how to calculate the Index Of Dispersion.

- First, determine the total variance.
- Next, determine the mean of the set.
- Next, gather the formula from above = IOD = V / m.
- Finally, calculate the Index of Dispersion.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem : **

Use the following variables as an example problem to test your knowledge.

total variance = 2.5

mean of the set = 60