Question

Five members of the football team and five members of the track team ran the 100-meter dash. Their times are listed in the table below:

Football Track
12.1 12.2
13.7 11.2
12.1 11.3
11.7 12.1
14.5 13.2


What is the difference of the means for the two groups?

Answer 1

Mean (average) of the football team:
(12.1+13.7+12.1+11.7+14.5)/5 = 12.82

Mean (average) of the track team:
(12.2+11.2+11.3+12.1+13.2)/5 = 12

Subtract: 12.82-12 = 0.82 s

So the difference of the means for the two groups is 0.82 seconds.