In a sample group of students, the number of breaths per minute was measured at rest and after exercise. The results were as follows:
At rest
Males: 10.1, 13, 12.5, 10.2, 13.1, 11.8
Females: 10.4, 13, 12.1, 11.9, 10.5, 12.8
After exercise
Males: 18.9, 23.7, 22.6, 21.3, 19.2, 20.6
Females: 25, 26.7, 29, 35.3, 33.1, 31.7
What is the average number of breaths per minute for males at rest?