The mean grade for a chemistry exam was 76% with a standard deviation of 6%. The mean grade for a statistics exam was 81% with a standard deviation of 2%. Jason got an 83% on both exams. Which one did he do relatively better on? Jason did relatively better on the statistics exam because his z-score is further above the mean than for the chemistry exam. O Jason did relatively better on the chemistry exam because his z-score is further above the mean than for the statistics exam. O Jason did equally well on both exams because both grades have a z-score above the mean of 83%. O Jason did better on the statistics exam because statistics is more difficult than chemistry. Jason did better on the chemistry exam because chemistry is more difficult than statistics.