Andrew scored 68 out of a possible 100 on his midterm chemistry examination. The distribution of the class had a mean of 59 and a standard deviation of 8.7. A friend of Andrew's who is in a different chemistry class scored 78 out of a possible 100. His class distribution had a mean of 66 and a standard deviation of 14. Relative to the performance of their classes, who did better? Explain why.