A student has final exam scores in two courses. In statistics, the final scores are approximately normally distributed with mean ${\mu }_S=78$ and standard deviation ${\sigma }_S=9$, and the student scored $88$. In calculus, the final scores are approximately normally distributed with mean ${\mu }_C=82$ and standard deviation ${\sigma }_C=6$, and the student scored $89$. On which course did the student do relatively better under the normal model?