The mean finish time for a yearly amateur auto race was 186.93 minutes with a standard deviation of 0.355 minute. The winning car, driven by Sam, finished in 186.14 minutes. The previous year's race had a mean finishing time of 111.6 with a standard deviation of 0.143 minute. The winning car that year, driven by Susan, finished in 111.15 minutes. Find their respective z-scores. Who had the more convincing victory?
Sam had a finish time with a z-score of .
Susan had a finish time with a z-score of .
(Round to two decimal places as needed.)
Which driver had a more convincing victory?
A. Sam a more convincing victory because of a higher z-score.
B. Susan had a more convincing victory because of a higher z-score.
C. Sam a more convincing victory because of a lower z-score.
D. Susan had a more convincing victory because of a lower z-score.