# What does mean deviation tell you?

The mean absolute deviation of a set of data is the average distance between each data value and the mean. The mean number of contacts stored and the distance each data value is from the mean is shown below. Each data value is represented by an ×. 48. 52.
A.

### What is the meaning of deviation?

The average of these numbers (6 ÷ 5) is 1.2 which is the mean deviation. Also called mean absolute deviation, it is used as a measure of dispersion where the number of values or quantities is small, otherwise standard deviation is used.
• #### Why do we calculate mean deviation?

Mean absolute deviation (MAD) Mean absolute deviation (MAD) of a data set is the average distance between each data value and the mean. Mean absolute deviation is a way to describe variation in a data set. Mean absolute deviation helps us get a sense of how "spread out" the values in a data set are.
• #### What is the definition of mean deviation?

Definition of mean deviation. : the mean of the absolute values of the numerical differences between the numbers of a set (such as statistical data) and their mean or median.
• #### What is the difference between mean deviation and standard deviation?

The standard deviation is simply the square root of the variance. The average deviation, also called the mean absolute deviation, is another measure of variability. However, average deviation utilizes absolute values instead of squares to circumvent the issue of negative differences between data and the mean.

Updated: 4th December 2019