The following data based on 450 students are given for marks in Statistics and Economics at a certain Examination: Mean Marks in Statistics 40 Mean Marks in Economics 48 S.D. of Marks in Statistics 12 The variance of marks in Economics 256 Sum of the products of deviations of marks from their respective means is 42075. (i) Obtain the equations of two lines of regression. (ii) Estimate the average marks in Economics of candidates who obtained 50 marks in Statistics. 1Wa are

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