The question asks for the possible range of the following set of numbers {2, -1, x, 5, 3}
The answer given is only 12 or -8, assuming x is the extreme lower value or the extreme higher value. But, how about if :
-1<x<5? The then range would be 5 - (-1) = 6, so 6 is a possible range value too, isn't it?
-f