1. Algebra 1(B) S TEM - AND -L EAF P LOTS

2. C HAPTER 8 W ARM -U P The population of Oswego in 2000 was 15,000. Since then, the town has experienced a 5.6% increase in population annually. How many residents can we predict there to be in Oswego today? 30,459 residents

3. C HAPTER 8 T EST C ORRECTIONS  Students will be placed into small groups  Corrections can be made to up to three problems to regain half-credit for each of them explanation of why your original answer was incorrect  Show your work on a separate sheet of paper along with an explanation of why your original answer was incorrect  Help each other!

4. O BJECTIVES  Display and interpret data on a stem-and-leaf plot

5. A PPLICATION OF S TEM - AND -L EAF P LOTS  Mr. Valdez wants to study the distribution of the scores for the last chapter test in Algebra 1(B). The scores of his 35 students in the class are listed below. 82774984449893 71766589957869 89648854879180 44859389556279 90867574996296

6. O RGANIZING D ATA  Stem-and-leaf plots are used to display a wide range of information. stems  The greatest common place value of the data is used to form the stems. leaves  The numbers in the next greatest common place value are used to form the leaves. 82774984449893 71766589957869 89648854879180 44859389556279 90867574996296 The greatest place value is tens. Thus, the number 82 would have stem 8 and leaf 2.

7. T O M AKE A S TEM - AND -L EAF P LOT StemLeaf 49 4 4 54 5 65 9 4 2 2 77 1 6 8 9 5 4 82 4 9 9 8 7 0 5 9 6 98 3 5 6 2 3 0 9 Steps: 1)Make a vertical list of stems based on the range of the values. 2)Plot each number by placing the units digit (leaf) to the right of the correct stem. Note: Note: A stem may have more than one digit. A leaf always has just one digit.

8. StemLeaf 44 4 9 54 5 62 2 4 5 9 71 4 5 6 7 8 9 80 2 4 5 6 7 8 9 9 9 90 2 3 3 5 6 8 9 T O M AKE A S TEM - AND -L EAF P LOT Steps: 3) Make a new stem- and-leaf plot with the leaf values in order.

9. U SING THE I NFORMATION 1. What were the highest and the lowest scores? StemLeaf 44 4 9 54 5 62 2 4 5 9 71 4 5 6 7 8 9 80 2 4 5 6 7 8 9 9 9 90 2 3 3 5 6 8 9 2. Which test score occurred most frequently? 3. In which 10-point interval did the most students score? 4. How many students received a score of 70 or better? 99 and 44 89 (3 times) 80-89(10 students) 25 students

10. E X. 1: S WAGGVILLE R ESIDENTS  The following data show the ages the 25 residents of Swaggville, Illinois. Make a stem-and-leaf plot to display the data. 452521040 50746311 31681230 64112378 4148425530

11. B REAK T IME  Take a 2-3 minute break to get up, stretch out, talk to a neighbor, or try the following rebus puzzles… Shop till you dropH 2 0 (water)

12. M ORE T HAN T WO D IGITS  Sometimes the data for a stem-and-leaf plot are numbers that have more than two digits. stem  In this case, you may need to put more than one digit in the stem.  Noteleaf  Note : Only one digit should go in the leaf.

13. E X. 2: B ENCH P RESS M AX  The numbers shown below represent the maximum bench press weight of 15 high school students. Create a stem-and-leaf plot to organize the data. 11013590 115150155 170175120 130140 145165170

14. E X. 2: B ENCH P RESS M AX  The numbers shown below represent the maximum bench press weight of 15 high school students. Create a stem-and-leaf plot to organize the data. 11013590 115150155 170175120 130140 145165170 StemLeaf 9 10 11 12 13 14 15 16 17 0 0 5 0 0 5 5 0 0 5 Notice that the hundreds and tens place have been included in the stem.

15. E X. 3: W EEKLY P AYCHECK mean medianmode  The data below represents the weekly paychecks of high school students that work. Find the mean, median, and mode of the data. StemLeaf 10 11 12 13 14 15 16 17 18 3 8 0 0 5 7 4 6 9 0 0 5 5 5 9 3 5 7 9 9 0 8

16. A SSIGNMENT  pgs. 371, 373 #9, 13-16, 34  Quiz on Friday!