Given, Numbers of observations are given.

To Find: Calculate the Mean Deviation.

Formula Used: Mean Deviation =

Explanation: Here, Observations 22, 24, 30, 27, 29, 31, 25, 28, 41, 42are Given.

Since, Median is the middle number of all the observation,

So, To Find the Median, Arrange the numbers in Ascending order, we get

22, 24, 25, 27, 28, 29, 30, 31, 41, 42

Here the Number of observations are Even then the middle terms are 28 and 29

Therefore, The Median = = 28.5

Deviation |d| = |x-Median|

And, The number of observations is 10.

Now, The Mean Deviation is

Mean Deviation =

Hence, The Mean Deviation is 8.7