Merry Christmas and happy calendrical convention. First lesson back is Friday 5th January. The days are getting longer now and the Sun is coming back!

The video above concentrates on drawing the cumulative frequency curve and on using the curve to find the median and the upper and lower quartiles.

You need to check that you can answer questions like “what percentage of the cress seedlings are greater than 50mm in length?”, and you may have intervals written in different ways. I’ll have the handout referred to up here in a day or so!