.55 is the answer. I hope this helped a great deal!
Solution: We are given below data:

Now to find the mean deviation, we use the below formula:

Where:
represents the summation
X, represents the observation.
represents the mean
N represents the number of observation.


Therefore, the mean deviation is:

= 4
You can use a calculator online you know? It is 21.3
Answer:
6.907
Step-by-step explanation: