Transcript Mean, Median, and Mode

MEAN, MEDIAN, AND MODE
Week 4: PSSA Survivor Math Lesson
MEAN, MEDIAN, AND MODE
All three are referred to as measures of central
tendency.
 Each can be important to help describe the value
in a set of data.
 In order to calculate any of these three, it is
easier to put the values in order first.

WHAT IS MEAN?
The mean is the average of a set of numbers.
 We find it by totaling the numbers and then
dividing it by the number of values we have.

EXAMPLE
Find the mean of the following numbers: 3, 7, 2,
12, 8, 7, 6, 2, 9, and 4
 Put them in order first: 2, 2, 3, 4, 6, 7, 7, 8, 9, 12


Answer: 6
WHAT IS THE MEDIAN?
The median is the middle value of a set of data
placed in numerical order.
 To find the median, when the numbers are in
order, just find the middle value. If “there are
two middle values”, just find their average.

EXAMPLE
Find the median of the following numbers: 3, 7, 2,
12, 8, 7, 6, 2, 9, and 4
 Put them in order first: 2, 2, 3, 4, 6, 7, 7, 8, 9, 12
 There are two middle numbers: 6 and 7. Find the
average of those two numbers.


The median is 6.5
WHAT IS THE MODE?
The mode is the number that occurs the most.
 If all numbers show up equally, then it is said to
be “no mode”.
 If more than two numbers (or more) show up the
most, then it is said that both numbers are the
mode.

EXAMPLE
Find the mode of the following numbers: 3, 7, 2,
12, 8, 7, 6, 2, 9, and 4
 Put them in order first: 2, 2, 3, 4, 6, 7, 7, 8, 9, 12
 Both the number 2 and 7 show up the most.
 Therefore, 2 and 7 are the mode.
