1. Mean, Median, Mode &Mean, Median, Mode &
RangeRange

2. Mean, Median, Mode areMean, Median, Mode are
all types of average. Anall types of average. An
average summarisesaverage summarises
groups of data.groups of data.

3. MeanMean
 Average often means the ‘mean’Average often means the ‘mean’
 Mean = total of the numbers dividedMean = total of the numbers divided
by how many numbers.by how many numbers.
Class shoe sizes: 3, 5, 5, 6, 4, 3, 2, 1, 5, 6
Add up the numbers:
3 + 5 + 5 + 6 + 4 + 3 + 2 + 1 + 5 + 6 = 40
Divide by how many numbers:
40 ÷ 10 = 4
The class mean shoe size is 4

4. MedianMedian
 Median is the middle valueMedian is the middle value
 Put the numbers in orderPut the numbers in order
 Choose the number in the middle ofChoose the number in the middle of
the list.the list.
 If there are 2 numbers in the middleIf there are 2 numbers in the middle
then it is halfway between them.then it is halfway between them.
Class shoe sizes: 3, 5, 5, 6, 4, 3, 2, 1, 5, 6
Put in order: 1, 2, 3, 3, 4, 5, 5, 5, 6, 6
The class median shoe size is 4.5

5. ModeMode
 Mode is the most common numberMode is the most common number
 Put the numbers in orderPut the numbers in order
 Choose the number that appears theChoose the number that appears the
most frequently.most frequently.
 Sometimes there may be more thanSometimes there may be more than
one mode.one mode.
Class shoe sizes: 3, 5, 5, 6, 4, 3, 2, 1, 5, 6
Put in order: 1, 2, 3, 3, 4, 5, 5, 5, 6, 6
The class modal shoe size is 5.

6. RangeRange
 Range is how far from biggest toRange is how far from biggest to
smallest.smallest.
 Put the numbers in orderPut the numbers in order
 Take the smallest number from theTake the smallest number from the
largest.largest.
Class shoe sizes: 3, 5, 5, 6, 4, 3, 2, 1, 5, 6
Put in order: 1, 2, 3, 3, 4, 5, 5, 5, 6, 6
Subtract smallest from largest: 6 – 1 = 5
Range: 5

7. RangeRange
 Range is how far from biggest toRange is how far from biggest to
smallest.smallest.
 Put the numbers in orderPut the numbers in order
 Take the smallest number from theTake the smallest number from the
largest.largest.
Class shoe sizes: 3, 5, 5, 6, 4, 3, 2, 1, 5, 6
Put in order: 1, 2, 3, 3, 4, 5, 5, 5, 6, 6
Subtract smallest from largest: 6 – 1 = 5
Range: 5