Statistics: The branch of mathematics that deals with collecting, organizing, and analyzing or interpreting data. Data: Numerical facts or numerical information. Mean: average of all #’s (add up and divide) Median: the middle number. Mode: the number that appears the most. Range: the difference between the largest and smallest number.

8 4 Stem Leaf Leaf: The last digit on the right of the number. Stem: The digit or digits that remain when the leaf is dropped. = 84

Here are the scores from two periods of math class. Students took the same test. Period 1: Period 2:

Period 1: * Step 1: Write the data in order from least to greatest. 57, 57, 58, 60, 63, 70, 72, 75, 75, 81, 81, 83, 85, 92, 94

Step 2: Divide the numbers into groups by their tens digit. 57, 57, 58, 60, 63, 70, 72, 75, 75, 81, 81, 83, 85, 92, 94

Step 3: Locate all of your stems (the number or numbers furthest to the left). *Write them under the stem section of your stem and leaf plot. 57, 57, 58, 60, 63, 70, 72, 75, 75, 81, 81, 83, 85, 92, 94 STEMLEAF Creating a Stem-and-Leaf Plot

Step 4: Locate all of your leaves (the number furthest to the right). *Write them under the leaf section of your stem and leaf plot. 57, 57, 58, 60, 63, 70, 72, 75, 75, 81, 81, 83, 85, 92, 94 STEMLEAF Creating a Stem-and-Leaf Plot

Step 5: Add a key! STEMLEAF Key: 7 5 means 75 Creating a Stem-and-Leaf Plot

Period 2: *Step 1: Write the data in order from least to greatest. 55, 55, 59, 60, 63, 67, 67, 72, 75, 79, 87, 88, 92, 95, 99 Let’s Try Again Creating a Stem-and-Leaf Plot

Step 2: Divide the numbers into groups by their tens digit. 55, 55, 59, 60, 63, 67, 67, 72, 75, 79, 87, 88, 92, 95, 99

Step 3: Locate all of your stems (the number or numbers furthest to the left). *Write them under the stem section of your stem and leaf plot. 55, 55, 59, 60, 63, 67, 67, 72, 75, 79, 87, 88, 92, 95, 99 STEMLEAF Creating a Stem-and-Leaf Plot

Step 4: Locate all of your leaves (the number furthest to the right). *Write them under the leaf section of your stem and leaf plot. 55, 55, 59, 60, 63, 67, 67, 72, 75, 79, 87, 88, 92, 95, 99 STEMLEAF Creating a Stem-and-Leaf Plot 9

Step 5: Add a key!! Key: 6 0 means 60 STEMLEAF

Comparing Two Sets of Data with a Stem-and-Leaf Plot STEMLEAF LEAF 3 0 Period 1Period 2 Key: means 57  55 Key: means 57  55

Comparing Two Sets of Data with a Stem-and-Leaf Plot

Double Stem-and-Leaf Plot

Reading a Stem-and-Leaf Plot What is the mean? What is the range?

Reading a Stem-and-Leaf Plot What is the median? What is the mode?

Reading a Stem-and-Leaf Plot

On the paper you have, find the mean, median mode and range of the following data represented in the stem-and-leaf plot.