Each week, Henri records the number of units of gas used in his house and the mean temperature outside. Ten of his results are shown in the table. Mean temperature (°C) 12.2, 13.8, 0.6, 2.2, 2.8, 4.4, 5.6, 6.8, 9.0, 10.6 Number of units 140, 100, 740, 570, 660, 600, 500, 560, 410, 320

1. (a)On the grid, complete the scatter diagram. The first five results have been plotted for you. [Grid with axes for Number of units and Mean temperature (°C)][2]
2. (b)What type of correlation does your scatter diagram show?[1]
3. (c)Draw a line of best fit on the grid.[1]
4. (d)Use your line of best fit to estimate the number of units used for one week when the mean temperature outside is 7.6°C.[1]

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.