Finding the Average or Mean of a Data Set

What is the mean?

• # happening the most
• the number in the middle
• biggest-smallest
• the average

Find the mean of

9, 11, 2, 6

• 4

• 5

• 6

• 7

Find the mean of these numbers:

5, 11, 2, 12, 4, 2

• 4.1

• 6

• 4.5

• 4

8. Find the mean.
120, 120, 90, 70

• 120
• 400
• 200
• 100

Find the mean:
3.8, 4.2, 4.0, 4.2, 4.2

• 4.08
• 20.4
• 5.1
• 4.2

Find the mean of the set of data

5.5, 4.5, 6.75, 3.25

• 6

• 4.5

• 5

• 4

Dr. Dre is a dentist. He needs to report on the average number of cavities that his patients have.
1,0,1,5,6,3,4

• 3.33
• 2.85
• 3
• 3.5

Find the mean of the data:
15, 17, 25, 30, 42

• 129
• 2.58
• 12.9
• 25.8

Find the mean of the data:
3, 18, 25, 32, 53, 72

• 33.8
• 3.38
• 2.03
• 203

What is the mean for these numbers?
5,5,5,5

• 5
• 20
• 15
• 100