For each of the data sets shown below, calculate r.
(a) (b) (c)
x y x y x y
1 6 1 2 1 7
2 7 2 1 2 6
3 5 3 4 3 5
4 4 4 3 4 4
5 3 5 7 5 3
6 1 6 5 6 2
7 2 7 6 7 1
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