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STATISTICS Stem and Leaf Diagrams Objectives Understand and use a stem and leaf diagram 15 Aug 2011 © Brain-Cells: E.Resources Ltd. All Rights Reserved.

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Presentation on theme: "STATISTICS Stem and Leaf Diagrams Objectives Understand and use a stem and leaf diagram 15 Aug 2011 © Brain-Cells: E.Resources Ltd. All Rights Reserved."— Presentation transcript:

1 STATISTICS Stem and Leaf Diagrams Objectives Understand and use a stem and leaf diagram 15 Aug 2011 © Brain-Cells: E.Resources Ltd. All Rights Reserved 24/11/09

2 Stem and Leaf Diagrams Use a stem and leaf diagram to record the numbers: 13, 18, 21, 24, 25, 32, 36, 37, 39 and 45 The numbers in red are the stem. These are units of ten. The numbers in green are the leaves. These are the units What is the median number? The two middle numbers are 25 and 32 so add then divide by 2. ( ) ÷ 2 57 ÷ 2 = 28.5 © Brain-Cells: E.Resources Ltd. All Rights Reserved 24/11/09

3 Back to Back Stem and Leaf Here are the ages of men and women at a gym Men 18, 22, 24,. 33, 33, 35, 37 41, Women 17, 18, 21, 23, 23, 24, 25, 31, 32 Put this data onto a back to back stem and leaf diagram WomenMen Copy and complete and find the mode median, mean and range for men and women. Comment on the results © Brain-Cells: E.Resources Ltd. All Rights Reserved 24/11/09

4 Back to Back Stem and Leaf Here are the ages of men and women at a gym Men 18, 22, 24,. 33, 33, 35, 37 41, Women 17, 18, 21, 23, 23, 24, 25, 31, 32 Put this data onto a back to back stem and leaf diagram WomenMen ModeMedianMeanRange Men Women Comment: The average woman is approximately ten years younger than the average man © Brain-Cells: E.Resources Ltd. All Rights Reserved 24/11/09


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