The mean finish time for a yearly amateur auto race was 187.97 minutes with a standard deviation of 0.308 minute. The winningcar, driven by Frank, finished in 187.18 minutes. The previousyear's race had a mean finishing time of 111.3 with a standard deviation of 0.136 minute. The winning car thatyear, driven by Karen, finished in 111.03 minutes. Find their respectivez-scores. Who had the more convincingvictory?

Frank had a finish time with az-score of

Karen had a finish time with az-score of