Find Karl Pearson's coefficient of correlation from following series of marks secured by 10 students in a class test in Economics and Quantitative Techniques. Marks in Economics: 45 70 65 30 90 40 50 75 85 60 Marks in Quantitative Techniques : 35 90 40 95 40 60 80 50 70 80 Also calculate its probable error. Is the value of r significant or not ?

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