# Mean. Median_ Mode and Range

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```					Mean. Median, Mode and
Range
How do we find the MEAN of a
group of numbers?
 If we are trying to find
the MEAN of a group
of numbers, what are
we actually looking
for?
And the survey says!!!!

AVERAGE
Finding the MEAN
Lets find the mean
together.

I have 6 people in my
family (including 2
dogs)
Ages of my family members
   My dad is 57 years old
   My mom is 55 years old
   My sister Jillian is 24 years old
   I am 29 years old
   Max, my big dog is 12 years old
   Lucy, the puppy is 1

 What is the mean (average) age of my family?
Now what?
 The first thing we need to do is put the set of
numbers we are working with in order.
 Lucy 1
 Max 12
 Jillian 24
 Me 29
 Mom 55
Next step
 The next thing I will do
is add up all the ages
of my family members
 1+12+24+29+55+57
 The total of all ages of
my family members
put together is 178.
Then what?
 After I added up all the
ages I need to divide by
the number of people in
my family.
 Since there are 6 people in
my family, I need to divide
the total of the ages (178)
by 6.

 6/178
Now I have found the Mean
 After dividing the total amount of all the ages
by the amount of people in my family the
MEAN age is 29.6
 Lets round up to the nearest whole number.
 The mean age for the people in my family
would be 30.
Now try it on your own
members (including dogs or cats).
 If you are not sure exactly how old they are
make a good guess.
Find that MEAN!!
Step 1- put all the ages of your family
members in order
Step 2- add up all the ages
Step 3- once you add the ages up and get a
total, divide by the number of people in your
family.
Step 4- if you need to, round to the nearest
whole number
How did you do?
Median
Finding the median of a
group of numbers is
very easy.

Lets find the median
using the amount of
runs that the Yankees
have scored over the
last 7 games.
Amount of runs scored by the
Yankees over the last 7 games
September   15th    4
September   16th    5
September   18th    2
September   19th   10
September   20th   1
September   21st   2
September   22nd   6
Finding the MEDIAN
 The median is the number that falls in the
middle.           Just like a median on the
highway.

 What do we need to do first?
 Line up all the runs in numerical order
 1, 2, 2, 4, 5, 6, 10
Lets find the Median
 After we line up all
numbers in the correct
order, we look at the
number that falls in the
middle.

 1, 2, 2, 4, 5, 6, 10
What is the MEDIAN of the runs the
Yankees have scored over the last 7
games?
 Find the median of the
following numbers

 21, 45, 6, 8, 34, 56, 15,
21, 30
And the survey says…
MODE
 The MODE is the number that occurs the
most.
 Lets go back to the runs scored by the
Yankees
Amount of runs scored by the
Yankees over the last 7 games
September   15th    4
September   16th    5
September   18th    2
September   19th   10
September   20th   1
September   21st   2
September   22nd   6
Finding the Mode
 1,2,2,4,5,6,10
 In that group of
numbers, what is
MODE?
 Remember that the
MODE is the number
that occurs the most.
Range
 The RANGE of a set of
data is the difference
between the highest
and lowest numbers in
the set

 In order to find the
range lets go back to
the ages of my family
members
Ages of my family members
   My dad is 57 years old
   My mom is 55 years old
   My sister Jillian is 24 years old
   I am 29 years old
   Max, my big dog is 12 years old
   Lucy, the puppy is 1
Finding the Range
 In order to find the RANGE we need to line
up our numbers in order.
 After this is complete you subtract the
lowest number from the highest.
 Since my dad is 57 and he is the oldest and
my youngest dog Lucy is 1, we subtract 57-
1.
 Our range is 56
 What is the range of
Lets review
 Mean
– average
 Median
– Number that falls in the middle
 Mode
– Number that occurs the most
 Range
– The difference between the highest and lowest
numbers in a set

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 views: 3 posted: 12/9/2011 language: pages: 28