Given, Numbers of observations are given.

To Find: Calculate the Mean Deviation from Mean.

Formula Used: Mean Deviation =

Explanation: Here, Observations 13, 17, 16, 14, 11, 13, 10, 16, 11, 18, 12, 17 are Given.

Deviation |d| = |x-Mean|

Mean =

Mean of the Given Observations =

And, The number of observations is 12.

Now, The Mean Deviation is

Mean Deviation =

Mean Deviation of the given Observations =

Hence, The Mean Deviation is 2.33