Answer
Minimum height 4.75 feet, maximum height 5.25 feet
Work Step by Step
Let h be the actual height of a horse face
The difference between the actual height and recommended height of the fence is at most 0.25 ft.
|h-5|≤0.25
h-5≤0.25 and h-5≥-0.25
h≤5.25 and h≥4.75
4.75≤h≤5.25