In a university where calculus is a prerequisite for the statistics course, a sample of students was drawn. The marks (out of 100) for calculus and statistics were recorded for each student. The data are as follows. Calculus 62 67 92 84 87 84 75 55 Statistics 83 72 87 78 79 79 85 60 a. Determine the correlation coefficient (r) between the two variables. Answer rounded to at least 4 decimal places.

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