Transcript Recap of Mean, Media..

Statistics
Part One: Recap of the Easy Stuff
Learning Objectives
 To review what we know/can remember
about mean, median, mode and range
What is the Mean?
Mean
I’m not really sure
What the MEAN is about
Just add them all up
And share them all out
The Mean
To find the mean of a set of data you need to:
1. Find the total of all the data
2. Divide the total by the number of data
values
e.g. Find the mean of these numbers:
1) 55, 23, 54, 12, 87, 32
2) 1.3, -0.34, -2.6, 0.57, 85
What is the Mode?
Mode
I don’t want to brag
I don’t want to boast
I am the MODE
I am the most
The Mode
The mode of a set of data is the most
common or most popular value
The mode does not have to be a number
e.g. Find the mode of these two sets of
data:
1) 95, 90, 91, 90, 89, 84, 90
2) a, b, c, b, c, b, a, b, a, c, c
What is the Median?
Median
I don’t know the rhyme
I don’t know the riddle
I am the MEDIAN
And I’m in the middle!
The Median
• The median is the piece of data in the middle
• To find it you must first put all the data in size
order
• If you have two middle values, add them together
and divide by two to get the answer
e.g. Find the median of these two sets of data:
1) 29, 25, 0, 32, 14, 22, 14
2) 3.2, -27, 8.65, 0.04, 22.3, -1.1
What is the Range?
Range
From largest to smallest
See how they change
Take them away
And I am the range
The Range
The range of a set of data is the
biggest value take away the smallest
e.g. Find the range of these numbers:
1) 321, 554, 201, 438, 212, 545
2) 0.97, -2.213, -2.5, -1.1, 0.499