statistics stem and leaf diagrams objectives understand and use a stem and leaf diagram 15 aug 2011...
TRANSCRIPT
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 www.brain-cells.co.uk
1 3 8
2 1 4 5
3 2 6 7 9
4 5
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 red are the stem. These are units of ten.
The numbers in green are
the leaves. These are the units
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.
(25 + 32) ÷ 2 57 ÷ 2 = 28.5© Brain-Cells: E.Resources Ltd. All Rights Reserved 24/11/09 www.brain-cells.co.uk
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, 43 47Women 17, 18, 21, 23, 23, 24, 25, 31, 32
Put this data onto a back to back stem and leaf diagram
Women Men
8 1 8
3 3 4 5 2 2 4
1 2 3 3
4 1
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 www.brain-cells.co.uk
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, 43 47Women 17, 18, 21, 23, 23, 24, 25, 31, 32
Put this data onto a back to back stem and leaf diagram
Women Men
7 8 1 8
1 3 3 4 5 2 2 4
1 2 3 3 3 5 7
4 1 3 7Mode Median Mean Range
Men 33 34 33.3 29
Women 23 23 23.8 15
Comment: The average woman is approximately ten years younger than the average man
© Brain-Cells: E.Resources Ltd. All Rights Reserved 24/11/09 www.brain-cells.co.uk