2-4 - Mean, Median, Mode and Range

Data SetTo find the mean:1. add all the numbers in the data set 2. divide by how many numbers there are.

18, 56, 90, 90, 25, 47, 36

Mean = AverageMean: the mathematical average of a set of numbers

Data Set:13, 27, 55, 72, 44, 31, 28, 27, 27

Data Set:10, 56, 23, 33, 45, 12, 18, 20

What is the mean?

What is the mean?

To find the middle you first have to make sure that your data set is in order from least to greatest.

Median =

Middle

Place the numbers in order by dragging them to the blue box.

2831

24

1311

556955

89

The median is the middle of a data set.

13 8955 7255312811 24

31 is the number that is exactly in the middle.31 is the median of this data set.

Now that the numbers are in order, let's find the median. Remember, the median is the number or number(s) in the middle.

Find the median of these two data sets

Data Set13, 89, 55, 72, 69, 31, 28, 11, 24

Remember toput them in order from least to greatest.

Data Set 7, 48, 84, 14, 90, 99, 37, 78, 31

Highlight the numbers as you count using the yellow and red squares to help you find the median.

13, 89, 55, 55, 69, 31, 28, 11, 24

Mode: is data which appears most frequentlyFrequently: how often something happens

Data Set

Which number is the mode?

55

Let's do some more!

13, 27, 55, 72, 44, 31, 28, 27, 27Data Set

What is the mode? 27

Sometimes there isn't a mode in a data set; this happens if all numbers are listed the same amount of times.

7, 48, 84, 14, 90, 99, 37, 78, 31Data Set

What is the mode?

None

Data SetTo find the range:1. list the numbers in the data set from least to greatest. 2. subtract the highest and lowest numbers.

89, 73, 84, 91, 87, 77, 94

Range: subtract the greatest number by the least number

Data Set:65, 56 , 57, 75, 76, 66, 64

Data Set:10, 56, 23, 33, 45, 12, 18, 20

What is the range?

What is the range?

Now Let's Test Your Knowledge

What is the mean of this data set?3, 7, 9, 12, 14

2

12

45

9

72

3

What is the medianof the following data set?

7, 14, 21, 28, 30

21730

A

B

C

What is the mode of thefollowing data set?

20, 34, 89, 67, 89, 4, 30

2089 4

A B C

What is the range of the following data set?

9, 1, 4, 8, 4, 7, 6, 7, 4

7 8 6

What is the mean of this data set?2, 4, 5, 6, 7, 7, 8, 25

6 7 8

9 10 64

What is the medianof the following data set?

1

1, 6, 8, 10, 12812

A

B

C

A B C

What is the mode ofthe following data set?

2, 5, 2, 7, 2, 8, 10, 2, 13

10 5 2

What is the range of this data set?21, 4, 17, 8, 10

17 12

11

4

60 21

2-3 - Line Plots

28 52 44 3917 44 36 7332 44 42 5340 33 33 37

Create a Line Plot:Data

15 20 25 30 35 40 45 50 55 60 65 70

Line Plot Vocabulary

Cluster - data that is grouped closely together

Outlier - data that is very far away from the other data

Range - the difference between the greatest and least number in the data set.