STEM AND LEAF DIAGRAMS.

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Statistics Stem and Leaf Diagrams.

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Presentation transcript:

STEM AND LEAF DIAGRAMS

STEM AND LEAF DIAGRAMS STEM LEAVES A Stem and Leaf diagram is a way of sorting data. They look like this. The data is split into tens (the stem) and the units (the leaves).

STEM AND LEAF DIAGRAMS We are going to put this data into a stem and leaf diagram. 12, 32, 22, 16, 24, 34, 12, 10, 25, 30, 28 STEM LEAVES 1 2 3 2 We have numbers in the tens, twenties and thirties so this becomes our stem. Now we need to enter the leaves. The first number twelve has a 2 in the unit column so this becomes the leaf.

3 2 STEM AND LEAF DIAGRAMS 12, 32, 22, 16, 24, 34, 12, 10, 25, 30 STEM LEAVES 3 2 1 2 3 2 6 2 2 4 5 8 The next number is 32. This has a 2 in the units column so it goes as shown. 2 4 The rest go as shown. Key: 1 2 = 12

STEM AND LEAF DIAGRAMS STEM LEAVES If an ORDERED stem and leaf diagram is required then you have to put the leaves in numerical order. 1 2 3 0 2 2 6 2 4 5 8 0 2 4 We can now use this to find the median. There are 11 pieces of data so the median is the 6th number. Key: 1 2 = 12 Median = 24

STEM AND LEAF DIAGRAMS STEM LEAVES Now put this data into an ordered stem and leaf diagram: 22, 34, 42, 13, 12, 41, 37, 28, 17, 47, 12, 24, 6, 9 1 2 3 4 9 2 3 7 4 8 7 1 2 7 Find the median. Median = 23 + 24 / 2 = 23.5