A group of high school students participate in an academic competition which tests students in various subjects. For the mathematics portion, the students scored a mean of 42 and a standard deviation of 9. For the social sciences portion, the students scored a mean of 50 and a standard deviation of 8. One of the competitors, Lukas, scored 56 on the math portion of the competition and 64 on the social sciences portion.

a) Find his zscore for the math portion. Round to the nearest hundredth.

b) Find his zscore for the social sciences portion.

c) On which portion did he have the better relative score?