Find the mean deviation about the mean for the data.

Solution:-

To find mean deviation, first we have to find mean

   

   

Determine the respective values of the deviations from mean,

i.e.,

   

are,

   

,

   

,

   

,

   

,

   

,

   

,

   

,

   

,

   

,

   

The deviations are

   

Therefore, the absolute values of the deviations,

   

   

We know that Mean deviation = sum of deviations/ number of observations

=

   

=

   

Hence, the mean deviation for the given data is