A student scored 618 on the mathematics part of the Scholastic Aptitude Test in a year in which the mean for that subtest was 457 and the standard deviation was 115. When the same student took a university entrance exam for engineers, he scored 173 on a mathematics test that had a mean of 134 and a standard deviation of 22. Round your answer to two decimal places if needed. a. What was his zscore for each test