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(k) The regression equations calculated from a given set of observations are 4x - 5y + 33 = 0 and 20x - 9y - 107 = 0. Find correlation coefficient between x and y. (1) The mode of the following distribution is Rs. 66. Find the missing frequency. Daily wages 30-40 40-50 50-60 60-70 70-80 (Rs.) No. of workers 8 16 22 28 ? 80-90 12 e7x -3x - 4x + 1 (m) Evaluate the limit: limx-70 x2