For Thursday the unit rate was 9.5 minutes for 1 mile, Wednesday the unit rate is 12 minutes for 1 mile, 9.25 minutes for 1 mile in Thursday, Saturday 10.5 minutes for 1 mile, and for Sunday 11.5 minutes for 1 mile.
Experimental probability is more accurate and more close to theoretical probability by having the most trials. More trials = more accuracy. Less trials = less accuracy.