Mike and Julie surveyed students to determine how many had a grade of A in math. They recorded their findings for each survey in the table below.
Students with an A in Math
Number of A grades Number of students surveyed
20
4
40
8
60
12
80
16
What is the constant of proportionality of the ratio of students surveyed to the number of A grades?
0.2
0.5
2
5
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