(9. The following table gives the distribution of items of production and also h rufativety defective items among them, according to size groups. Find the correlation coefficient between size and defect in quality and its probable error. 18-19 Size-group 15-16 16-17 17-18 19-20 20-21 : No. of items 200 270 340 360 400 300 180 No. of defective items : 180 ban 150 162 170 114

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