A randomsample of 11 truant students produced the following data, where xis the number of classes missed, and yis 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?