Answer:
0.142 cm/yr
Step-by-step explanation:
An average is the sum of all the measurements divided by the number of measurements.
If there was a measurement each year, there were 175 measurements, and their sum is 24.8 cm.
Average movement = 24.8/175
Average movement = 0.142 cm/yr
The land moved an average of 0.121 cm each year