A cross-country sprint skier keeps track of how his practice times compare to a qualifying time for a race. A negative number means he skied faster than the What is the mean difference between the skier's practice times and the g time. His results are shown in the table. qualifying time?
1. 1.25
2. -5.38
3 -0.92
4 2.19
5 -6.74
6 -2.46