### Present Remotely

Send the link below via email or IM

• Invited audience members will follow you as you navigate and present
• People invited to a presentation do not need a Prezi account
• This link expires 10 minutes after you close the presentation

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

# Stem and Leaf Diagrams

No description
by

## Mr Mattock

on 11 April 2018

Report abuse

#### Transcript of Stem and Leaf Diagrams

Stem and Leaf Diagrams
Starter
To group or not to group?
Imagine you are recording ages of people in a supermarket.

Why would you not want to group this data?

What would the problems be leaving it as raw data?

How could you represent the data to solve these problems?
L.O. - Understand data represented in a stem and leaf diagram and find the median and inter-quartile range from a stem and leaf diagram.

20 >> ÷5 , x2 , +10 , ÷9 , square , +3 , x2 , x2 , ÷7 , ………….

61 >> -13 , ÷12 , x60 , -10 , ÷2 , -1 , ÷6 , -4 , ÷3 ………….

16 >> x4 , -8 , ÷4 , x10 , +13 , ÷9 , x2 , +18 , ÷4 ………….

50 >> ÷5 , x2 , +8 , ÷7 , square , +2 , x2 , x2 , ÷8 ………….

36 >> ÷4 , x3 , +6 , ÷3 , x4 , +12 , ÷8 , +5 , x3 ………….
Starter

20 >> ÷5 , x2 , +10 , ÷9 , square , +3 , x2 , x2 , ÷7 , …
4
.

61 >> -13 , ÷12 , x60 , -10 , ÷2 , -1 , ÷6 , -4 , ÷3 …
5
.

16 >> x4 , -8 , ÷4 , x10 , +13 , ÷9 , x2 , +18 , ÷4 …
13
.

50 >> ÷5 , x2 , +8 , ÷7 , square , +2 , x2 , x2 , ÷8 …
9
.

36 >> ÷4 , x3 , +6 , ÷3 , x4 , +12 , ÷8 , +5 , x3 …
36
.
To group or not to group?
Imagine you are recording ages of people in a supermarket.

Why would you not want to group this data?
Buying patterns may be very different even within likely age groups.
What would the problems be leaving it as raw data?
Very hard to analyse and spot patterns/find averages if large amount of data collected.
How could you represent the data to solve these problems?
Find a way of grouping data that then also allows you to see individual values.
Drawing a Stem and Leaf Diagram
Ordering a Stem and Leaf Diagram
Ordered Stem and Leaf Diagram
Stem and Leaf diagrams
What stem would you use for this data?

a) 132, 143, 135, 154, 137, 149, 128, 136, 141, 150

b) 7.8, 8.6, 9.3, 7.4, 7.8, 8.8, 10.2, 9.4, 7.1, 8.0

Put this data into an ordered stem and leaf diagram.

Can you find the median and range from the stem and leaf diagram?
Stem and Leaf diagrams
12
13
14
15
8
2 5 6 7
1 3 9
0 4
7
8
9
10
1 4 8 8
0 6 8
3 4
2
12

8
= 128
7

1
= 7.1
Median and IQR
12
13
14
15
8
2 5 6 7
1 3 9
0 4
7
8
9
10
1 4 8 8
0 6 8
3 4
2
12

8
= 128
7

1
= 7.1
Median =
IQR =
Median =
IQR =
Median and IQR
12
13
14
15
8
2 5 6 7
1 3 9
0 4
7
8
9
10
1 4 8 8
0 6 8
3 4
2
12

8
= 128
7

1
= 7.1
Median = 137+141 = 139
2
IQR = 149 - 135 = 14
Median = 8.0+8.6 = 8.3
2
IQR = 9.3 - 7.8 = 1.5
Median and IQR
Median =

IQR =
Median and IQR
Median = 36

IQR = 45.5 - 22.5 = 23
Key
Examples

Activities
Activity