Students of a certain course tell that the teacher has the habit of being late. The following data represents the minutes that have arrived sooner or later in a sample of 25 classes. The positive numbers represent the delays and the negative ones the early arrivals.

16

20

-40

4

55

12

-5

-7

10

12

12

15

15

15

-34

0

0

-5

-5

-5

50

2

3

5

0