Transcript STATISTICS - University of North Texas

STATISTICS
Ashley Johnson
LTEC 4100 Section 6
February 4th 2009
UNIT QUESTION
 What is the definition of Mean
 What is the definition of Median
 What is the definition of Mode
ESSENTIAL QUESTION
 Can you determine which “M” to use
in different situations?
MEAN
 The mean is the average of a group
of numbers.
 The mean of the numbers: 1, 4, 2,
and 5 is 3
 First step: add all of the numbers.
1+4+2+5=12
 Second step: divide the total by the
amount of numbers (4). 12/4=3
MEDIAN
 The median is the middle number of a
group of numbers
 The median of the numbers: 1, 3, 5,
7 and 9 is 5.
 If there is an even amount of
numbers: 2, 4, 6 and 8, you add the
two middle numbers and divide by 2.
The median: 4+6=10, divided by 2 is
5.
MODE
 The mode is the number that occurs
the most in a group of numbers.
 The mode of the numbers:1, 1, 2, 1,
2, 2, 3, 1 is 1. There are four 1’s,
three 2’s and one 3. There are more
1’s than any other number.
FROM THE TEKS (7.12)
 Probability and statistics.
 The student is expected to:
 Describe a set of data using mean,
median, mode.
 Choose among mean, median, mode
to describe a set of data and justify
the choice for a particular situation.
REFERENCES
 ritter.tea.state.tx.us (TEKS website)