7 (a) Explain the pattern in the graph between 4 minutes and 20 minutes. The quality of written communication will be assessed in your answer to this question. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... .............................................................................................................................................. [6]
Š OCR 2013
Turn over for the remainder of question 4