Leafy Maths Investigating leaf size for different trees How can we collect a random sample of 20 leaves? What measurement shall we take? Leaf A length mmLeaf B length mmLeaf C Length mm Stem and leaf plot Leaf A length mm Leaf B length mm Leaf C Length mm Median Analysing the Data Measure the leaves mm Put this data into a excel Sort it smallest to largest Calculate min, max, Q1, Q2, Q3 What are quartiles? Here are 20 leaf lengths Q1 Min Q2 Max Q Leaf A length mm Leaf B length mm Leaf C Length mm Q1 Min Q2 Max Q3 Quartiles Draw a box plot Min, Q1,Q2, Q3, Max Calculate mean and Standard deviation You can draw a similar box plot to the quartiles now Each pair work out A, B or C Examples of box plots Try to find some of your own. Searchon box plots and imageswww.google.co.uk Leaf A length mm Leaf B length mm Leaf C Length mm Ordered Leaf A length mm Leaf B length mm Leaf C Length mm