(b) A statistician attached to SOLA establishes that the semester mark x of a student could be used to predict his examination mark y. She collects the following data for a subset of the APMA2B2 class: I 40 51 80 66 73 41 75 56 73 Y 36 Use a linear fit to predict the examination mark of a student who obtains a semester mark of 55. When solving for the coefficients of the polynomial, implement Gauss elimination and (8) show all your calculations.