# z-score for two variables

Can we study the relationship between two variables using z score? For example: Let us say that we have two classes A, B and we have 5 students in each class and we know the age and the grade for every student. and we want to study the relationship between age and the grades.

  age     class A  grades
10       75
13       85
20       55
16       45
19       90

12       65
9       54
13       67
21       90
23       85


If we calculate the Z score for age and for the grades then we can estimate how far is the grades or the ages from the mean. How can we visualize the relationship between the grades and the age using Z score in this case?