4. The following tables shows the original marks of six candidates in two examinations. Candidate A B C D E F English 38 62 56 42 59 48 History 64 84 84 60 73 69 (a) Calculate the correlation coefficient, r. [4] (b) Use the value obtained in (a) to explain what type of relationship exist between the variables.[2]c (c) Determine the regression line in the form y = a + bx [2] (d) Using your equation found in (c), predict the History mark of a candidate scoring 50 in English. [2]