1. Warm Up

2. 1.2 “Averages”

3. Ages of 7 us…

4. Different measures of average Mean= Median= Mode= Which one seems most accurate for what we think of as average? Any ideas how I got these numbers?

5. Definitions Mean: “true average”. Add all #’s together, and divide by the total number of #’s. Median: “The middle #”. List all the #’s from least to greatest and find the middle #. If there are two in the middle, then take the mean of the two. Mode : The # that occurs most.

6. Example 1 {2, 5, 6, 2, 10} Mean: 2+5+6+2+10 = 25/5 = 5 Median: 2,2,5,6,10-------5 Mode: 2

7. Example 2 {100,500,300) Mean: 100+500+300 = 900/3 = 300 Median: 100, 300, 500 = 300 Mode: No mode (because no number is repeated)

8. Example: Your Turn! {21, 35, 1, 7, 12} Mean= 15.2 Median= 12 Mode= no mode Bonus: What is the RANGE of this data set? Answer: max-min = 35-1 = 34

9. Try again! {3, 4, 3, 6, 6, 2} Hint: Look at your definition for Median! Mean=4 Median=3.5 Mode= 3 and 6.

10. What if you have a graph? Simply convert the graph to numbers.

11. Example Find the mean, median and mode of the dot plot below. Ideas…..?

12. Solution List the numbers that the dots represent. 5, 5.5, 6, 6, 6, 6.5, 6.5, 6.5, 6.5, 7, 7, 8, 8, 9

13. You know what to do from here… 5, 5.5, 6, 6, 6, 6.5, 6.5, 6.5, 6.5, 7, 7, 8, 8, 9

14. Homework 1.2 Worksheet Skip #3.