Averages and range presentations and differentiated worksheets

I spent an enormous amount of time preparing these for some observed lessons and they are suitable for two to four lessons depending on the ability of the class.
They are really well differentiated and really help the students develop a solid understanding of not only the averages and range, but what they mean and all the different ways you could be asked to find them.
There are three powerpoints: The mode & median, the mean, the range & making comparisons. There is a corresponding fully differentiated worksheet that goes with each powerpoint, with the level of difficulty increasing as the columns move across the page.