Query about Question 13 from "GRE Quant Flashcards Group 13 Quiz" [5383]

https://www.gregmat.com/quizzes/quiz/gre-quant-flashcards-group-13-quiz (Question 13)

Hello,

In the question above, the range could be 0 with set of integers like -10,1,2 and 10. Here the median would not be an integer. Am I missing something?

Wouldn’t the range be 10 - (-10) instead of 10 - 10?