128 times 2 is 256 divided by 2 is 128 scoops of ice cream
Multiply both sides by three to get 2x=30
Then divide both sides by 2 to get x=15
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