The range of x will be 1<x<7. But the possible values of x will be 2 to 6 right? So the range wont be 4? instead of 6.
The wording could certainly be improved, as you pointed out. But your reasoning for it being 4 isn’t correct either. What about if we have x_{\text{min}} := 1.1 and x_{\text{max}} := 6.9?