Coach Burns charted the change in his runners' 5K times from the first race of the year to the second race of the year.
Which student improved the most by decreasing the time needed to run the race?
Overall Change in 5K Times from the First to the Second Race
Runner
Time over (+) or under (-) previous run
Albert
-15.7 seconds
Cody
+1.4 seconds
Hannah
+4.5 seconds
Yasim
-37.4 seconds
Albert
Cody
Hannah
Yasim