2. P.O.D. #1
basic
advanced
256 ÷ 4
= 64
482 ÷ 8 =

3. Interpreting Measures of Center

4. Mean
The sum of the data divided by the number of items in the data set.
Usually thought of as the average.
Example:
Julie’s score on the math tests this year are 85, 67, 92, 50, 100, and 92.
Mean = ( ) 6
= 486 6
= 81

5. Median
The value appearing at the center of a sorted list.
Numbers must be written in order from least to greatest.
If the set has two numbers in the middle, you add the 2 numbers and divide by two to find the median.
Example:
Julie’s score on the math tests this year are 85, 67, 92, 50, 100, and 92.
50, 67, 85, 92, 92, 100.
Median = 2
= 177 2
= 88.5

6. Mode
The value that occurs most often.
A data set can have no mode, one mode, or more than one mode.
Example:
Julie’s score on the math tests this year are 85, 67, 92, 50, 100, and 92.
50, 67, 85, 92, 92, 100.
Mode = 92

7. Find the mean of the following set:
Whiteboard:
Find the mean of the following set:
6 , 2 , 3 , 8 , 9 , 7 , 8 , 4 , 7
( ) 9
= 54 9
= 6

8. Find the median of the following set:
Whiteboard:
Find the median of the following set:
5 , 3 , 7 , 8 , 7 , 6
3, 5, 6, 7, 7, 8
Median = 6 + 7 2
= 13 2
= 6.5

9. Find the mode of the following set:
Whiteboard:
Find the mode of the following set:
3 , 9 , 3 , 7, 4 , 9 , 3 , 7 , 4, 7, 11
3, 3, 3, 4, 4, 7, 7, 7, 9, 9, 11
Mode = 3 and 7

10. (12 + 6 + 8 + 13 + 14 + 3 + 14) 7 = 70 7 = 10 Month Days over 70°
Whiteboard:
Month
Days over 70°
March 12
April 6
May 8
June 13
July 14
August 3
September
A weather station created this table to show the number of days over 70°.
Find the mean number of days above 70°.
( ) 7
= 70 7
= 10

11. 3, 6, 8, 12, 13, 14, 14 Median = 12 Month Days over 70° March 12 April
Whiteboard:
Month
Days over 70°
March 12
April 6
May 8
June 13
July 14
August 3
September
A weather station created this table to show the number of days over 70°.
Find the median number of days above 70°.
3, 6, 8, 12, 13, 14, 14
Median = 12

12. 3, 6, 8, 12, 13, 14, 14 Mode = 14 Month Days over 70° March 12 April 6
Whiteboard:
Month
Days over 70°
March 12
April 6
May 8
June 13
July 14
August 3
September
A weather station created this table to show the number of days over 70°.
Find the mode.
3, 6, 8, 12, 13, 14, 14
Mode = 14

13. Mean = 10 Median = 12 Mode = 14 Month Days over 70° March 12 April 6
Whiteboard:
Month
Days over 70°
March 12
April 6
May 8
June 13
July 14
August 3
September
A weather station created this table to show the number of days over 70°.
If you were trying to convince a friend that it was an especially warm summer, which measure of center would you use?
Mean = 10
Median = 12
Mode = 14

14. P.O.D. #2 basic advanced 102 + x 7 = 18 X = 24
Mrs. Sprinkles class received the following scores on their last quiz:
12, 18, 14, 19, 20, 19
What score would the next student need to receive to make the mean score 18?
Mrs. Sprinkles class received the following scores on their last quiz:
12, 18, 14, 19, 20, 19
Find the mean, median, and mode of the scores.
102 + x 7
Mean- 17
Median- 18.5
Mode- 19
= 18
X = 24

15. Range is the difference between the largest and the smallest value in a set of data.
13, 18, 13, 14, 13, 16, 14, 21, 13
The largest value in the list is 21, and the smallest is 13, so the range is
21 – 13 = 8.

16. Find the range of the following set:
Whiteboard:
Find the range of the following set:
3 , 9 , 3 , 7, 4 , 9 , 3 , 7 , 4, 7, 11
11 − 3 = 8

17. Find the range of the data.
Whiteboard:
Month
Days over 70°
March 12
April 6
May 8
June 13
July 14
August 3
September
A weather station created this table to show the number of days over 70°.
Find the range of the data.
14 − 3 = 11

18. Measures of Center
Fortune Teller/ Cootie Catcher

19. Outside Corners: include brief definition
mean
median
mode
range
Inside: 8 sets of data (5 or 6 numbers each)
Inner Flap- answer key for each set of data
mean
median
mode
range