The instructor divides her semester into 3 months, each month having 8 PE lessons, each lesson containing 10 trials of kicking. For her first month, she gives student feedback after every other trial. Then for the second month, she waits for the students to complete all 10 trials and afterwards discusses each trial with students. Finally, on the third month, she only gives feedback if the students do not kick with their shoelaces.

What is the absolute frequency feedback the instructor gave students at the end of first month?

10

40

80

5