Statistics 10.11.12
Stem and Leaf
diagrams
used to
organise data
ordered from smallest to
biggest
example 48 ,
51 ,
56 52 64 45 ,
60 , 52 ,
71 63
, ,
, ,
stem
stem leaf leaf
4 5 8
5 1226
has 1
6
7-
034
1
Data
digit ,
stem is
Other to represent data
ways :
The Mean ✗
of all the data
average
* add all data values divide total
then
by the
number of data values
✗ = E. ✗
n
, The Mode
occurs the most often ,
has the
highest frequency
Hoo set of data can have more than 1 mode
Ñ0• You can find the mode of
categorical data
example 5 ,
9 ,
12,5 ,
3
,
11
,
8 ,
3
mode : 5313
mode >
highest frequency
The Median M
middle data if
value in
ascending order
position median number data values
nztl
of = * n =
of
example 6,9 ,
12 ,
5 , 3,11 ,
8,3
order 11 12
ascending :
3,3 ,
5,6 , 8,9 , ,
between M
6zt8_
these
:
=
2
= 7
The Range
measure of dispersion
range
=
highest data valve -
lowest data value
data
** No
range
of
categorical
Stem and Leaf
diagrams
used to
organise data
ordered from smallest to
biggest
example 48 ,
51 ,
56 52 64 45 ,
60 , 52 ,
71 63
, ,
, ,
stem
stem leaf leaf
4 5 8
5 1226
has 1
6
7-
034
1
Data
digit ,
stem is
Other to represent data
ways :
The Mean ✗
of all the data
average
* add all data values divide total
then
by the
number of data values
✗ = E. ✗
n
, The Mode
occurs the most often ,
has the
highest frequency
Hoo set of data can have more than 1 mode
Ñ0• You can find the mode of
categorical data
example 5 ,
9 ,
12,5 ,
3
,
11
,
8 ,
3
mode : 5313
mode >
highest frequency
The Median M
middle data if
value in
ascending order
position median number data values
nztl
of = * n =
of
example 6,9 ,
12 ,
5 , 3,11 ,
8,3
order 11 12
ascending :
3,3 ,
5,6 , 8,9 , ,
between M
6zt8_
these
:
=
2
= 7
The Range
measure of dispersion
range
=
highest data valve -
lowest data value
data
** No
range
of
categorical
