Answer:
3 and 9
Step-by-step explanation:
The mean of the data values = 53
When x=56
![x-\operatorname{mean}=56-53=3]()
Therefore, fill the blank in the first column with 3.
Next, take the square:
![(x-\operatorname{mean})^2=3^2=9]()
Therefore, fill the blank in the second column with 9.
The filled table is attached below: