Grade 8 - 20 minutes work on your investigation, please. The deadline will be the END of the lesson next week for the 8.15 group, the week after for the 11.45 group. You need to hand in a paper copy then.
Grade 7 - 20 minutes work on your investigation, please. This could be thinking about what your results show so that you can finish your conclusion and evaluation in the lesson next week. In case you need them, the chart of the results from each group, is here lesson notes.
Grade 9 - next week we will be using spreadsheets to produce graphs. Watch this video to refresh your memory. Failure to plot a simple graph using googlesheets will Unleash The Snark from me.