Question 4 Consider the following data of number of absences and the final grade of the seven students in the mathematics and statistics class given in the table below. Student No of absences (X) Final grade % (Y) 82 86 15 43 74 12 58 90 78 6259258 ABCDEFG Required: a) If the equation of a line is y = a + bx, calculate the equation of the line (show in a table how the values for a and b can be derived) (15 marks) b) What would be the approximate grade if there was one person absent? (5 Marks) c) Calculate the correlation coefficient and interpret it.(5 Marks)