1.求极差：18, 71, 75, 78, 67, 70, 66

2.求极差：14, 71, 52, 4, −2

3.求极差：52, 79, 37, 45, 35, 12, 3, −9

4.求极差：6, 67, 18, 76, −4, −9, 70

5.求极差：30, 56, 79, 24, 27, 76, 35, 64

6.求极差：26, 78, 61, −1, 52, 39, 14, 49, 67

7.求极差：27, 51, −6, 42, −1, −5, 8, −6, 20

8.求极差：66, 38, 56, 49, 51, 36, 40, 49, 42

9.求极差：8, −2, −6, 27, 72, −7, 11, 39, 4

10.求极差：65, −5, 25, −8, 64

11.求极差：19, 27, 15, 68, 74

12.求极差：61, 22, 18, 2, −14, 10, 26, 3

13.求极差：32, 33, 8, 20, 17, 15, 34, −11, 3

14.求极差：32, −14, 26, 9, 47, 69, 65, 74

15.求极差：80, 37, −3, 72, 51, 53, 66, 43, −2