Year 8 Height Graph

Year 8’s are learning about Data and Graphs at the moment. The students were asked to measure each others heights and draw an appropriate graph. Here is Jordan’s:

I was impressed with Jordan’s drawing skills but not so much his graphing ability! However, his graph is a good example of how graphs can misrepresent data. According to the relative sizes of people Jordan has drawn, he looks to be twice as tall as Vinnie and nearly three times as tall as Tina!

Jordan did however, calculate the mean, median, mode and range correctly. I was also pleased to see he could use correct notation for a repeating decimal.

The next logical step will be to get Jordan to represent his data with a box and whisker plot. Then compare with another Year 8 class and then a large sample from Census at School.

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About webmaths

I have been teaching Mathematics in Victorian secondary schools for 30 years. I use the www to make my maths lessons better. I hope this blog will give other teachers some ideas to try in their own classes.
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