A random sample of 11 truant students produced the following data, where x is the number of classes missed, and y is the final exam score (out of a maximum of 75 points). The data are presented below in the table of values.

x y

10 54

11 41

12 37

14 36

15 29

16 28

18 28

19 26

22 19

25 19

26 18

What is the value of the correlation coefficient of the regression line, r, rounded to four decimal places?

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