1. Review
Check to see if the ordered pair is a solution or not to X + y < -1 (-3,-1) (0,2)
Solve and graph 2x + 3y > 12

2. 6.6 stem/leaf plots and mean, median, and mode

3. Notes
Measure of Central Tendency: describe the center of data. Mean: average add all #’s # of items BEST: NO OUTLIERS
3, 5, 2, 5, 2, 3, 1

4. Median Notes
3, 8, 2, 3, 8, 3, 10 11, 21, 43, 1, 5, 9
Median: middle number.
Must be least to greatest.
If two numbers, add and divide by 2
BEST: NO OUTLIERS; NO BIG GAPS IN MIDDLE OF NUMBERS

5. Mode Notes Mode: most occurring numbers. BEST: MANY REPEATED NUMBERS
3, 4, 5, 3, 5, 6, 8, 3, 8

6. Find Mean
4, 5, 9, 3, 4, 8, 10, 3
10, 11, 4, 30, 45

7. Find Median
1, 5, 6, 8, 10, 7, 8, 9
5, 8, 9, 1, 2, 5, 7

8. Find Mode
12, 11, 10, 9, 8, 11, 15
1, 1, 8, 9, 8, 12, 5, 6, 7

9. Information stem/leaf
Stem/leaf plot: display data by digits.
Stem: 1st digits
Leaf: last digit
Ex: 34
3 is the stem
4 is the leaf
To make:
Create key
Draw graph, i.d. stem and leaf
Put stems in order

10. Stem Leaf plot
23, 25, 45, 21, 54, 60, 68, 49, 52
234, 245, 257, 249, 307, 238, 240, 265

11. Stem/Leaf plot
17, 11, 25, 58, 96, 28, 11, 19, 20 , 31
170, 152, 179, 182, 193, 158, 149, 160

12. Wrap up
Questions/Comments
Hw: worksheet