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1. Alex and Kris are riding their bicycles together along a bicycle trail and note the following distance markers at the given times, Time (f hours) 2 3 7 Distance (d km) 57 65 72 18 89 97 107 (a) Draw a scatter diagram of the data. (b) Write down for this set of data (i) the mean time, 1: (ii) the mean distance, d. (2) (c) Mark and label the point M (. d) on your scatter diagram. (d) Draw the line of best fit on your scatter diagram, (e) Using your graph, estimate the time when Alex and Kris pass the 85 km distance marker. Give your answer correct to one decimal place, (2) n Write down the equation of the regression line for the data given. (2) (@) (1) Using your equation calculate the distance marker passed by the cyclists at 10.3 hours. (ii) Is this estimate of the distance reliable? Give a reason for your