6. The table shows some of the points on the graph of a quadratic function. All real numbers greater than or equal to -4
х
-4
9.5
1.5
All real numbers less than or equal to 6
-2
-1
1
-1
All real numbers less than or equal to 9.5
3
-3
-1
5
5
All real numbers greater than or equal to -3
6
9.5

What is the range of the quadratic function?