Median Review

Median Review

Finding Median is a key concept to Box and Whisker plots.

Median Basics

• Median is the middle value if a set of numbers

• The MUST be listed from least to greatest

Median Example

• 9 is the median in this set of numbers.

• it is the MIDDLE VALUE

Multiple Choice

Lets start off with an easy one:

What is the median of this set of data?

15, 16, 17

• 15

• 16

• 17

Multiple Choice

Try another one with a few more numbers:

find the median:

10, 16, 21, 23, 25

• 10

• 16

• 21

• 23

When finding median

• Make sure there are the same number of values on each side of median

• in this example, 3 values to the left

• 3 values to the right...

Multiple Choice

Try another one

Find the Median:

10, 14, 15, 17, 19, 20, 23

• 10

• 14

• 15

• 17

Multiple Choice

Now one a bit harder:

Find the median

23, 25, 25, 26, 28, 29, 30, 32, 34, 36, 37

• 26

• 28

• 29

• 30

Median Level 2

• The given values MUST be in order from least to greatest

• If they are not given in that order

• You NEED TO REORDER the valuse to get the correct mean

Multiple Choice

Try an Easy one:

Find the Median

45, 36, 52

• 45

• 36

• 52

You need to order values from least to greatest

36, 45, 52 making 45 the median

Multiple Choice

Try another one: Make sure to order the values from least to greatest

Find the Median

8, 2, 1, 5, 7

• 1

• 5

• 7

Median Level 3

• If there are an even number of values in the set

• you will have two numbers in the middle

• You must find the average of those two numbers

Multiple Choice

Try and easy one:

find the median

11, 12, 14, 15

• 12

• 13

• 14

11, 12, 14, 15

• 12 and 14 are in the middle

• find the mean of 12 and 14

• 12+14 divided by 2

• the result, 13, is the median

Multiple Choice

Try another one:

Find the median

36, 41, 46, 58

• 41

• 46

• 43.5

• 40.5

36, 41, 46, 58

• 41 and 46 are in the middle

• find the average of those two numbers

• 41+46 = 87

• 87 divided by 2 = 43.5

• the median is 43.5

Closing: To find median you need 3 things

• the values ordered from least to greatest

• find the middle value

• If there are two numbers in the middle, find the mean of those two numbers.