Data Management

Bar Graphs are used
to compare data.

Line Graphs are used to
show change over time.

Scatter Plots are used to
show the type of
relationships exists
between two sets of data.

Stem and Leaf Plots are used
to order data by place value.

Circle Graphs are used to represent
data as percentage or as a whole.

Mean

What is a Mean?

The mean is
the average.

How to
calculate
the mean?

To get the mean,
you firstly, need
to add all the
numbers in the
set of data. Then,
you divide the
answer by how
many numbers are
in the set. The
answer is your mean.

Example

2,5,6,5,4

2+5+6+5+4=
22
22÷5=4.4

Median

What is a Median?

The median is
the middle
number when
data is arranged
in numerical order.

How to
get the
median?

To get the median,
you first need to put
the numbers in order
from least to greatest.
Then, you cross out all
the side numbers, till
you get to the middle
one which is your median.
If their are two left over
numbers then you do the
mean to it, meaning add
first then divide the
answer by 2.

Example

Without doing
the mean:
2,3,5,6,8,9,7

With doing
the mean:
2,1,3,5,6,7

X,X,3,5,X,X

3+5=8
8÷2=4
4=median

Mode

What is a Mode?

The mode is
the number
that occurs
the most often
in the set of
numbers.

How to
figure out
the mode?

All you need to
do to find the
mode is,
basically just
see which
number comes
the most in the
set. If there is 1
number that comes
the same number of
times as another
number than there are
2 modes. If all the
numbers come only
once than there is no
mode.

Example

1 Mode:
5,4,4,8,9
Mode=4

No Mode:
3,5,8,9,1
No Mode

2 Modes:
3,3,6,7,7,5
Mode=3&7

Range

What is Range?

Range is the
difference
between the
greatest and
least number
in a set of data.

How to get
the range

To get the range,
all you need to do
is, subtract the
highest number by
the lowest number.
The sum is the range

Example

Set of Data:
2,5,6,4,3,8,9
Highest Number:9
Lowest Number:2
9-2=7
Range=7