Final answer:
The range of the given domain is 3.
Step-by-step explanation:
The range is the difference between the largest and smallest values in a data set.
In this case, the values in the domain are 1, 2, 3, and 4.
To find the range, we calculate the difference between the largest value, which is 4, and the smallest value, which is 1. The range is therefore 4 - 1 = 3.