Grade 7 students in Saxon Math Course 2 learn how to organize and analyze data using stem-and-leaf plots and box-and-whisker plots. The lesson covers key statistical measures including mode, range, median, and quartiles, showing students how to identify lower and upper quartiles by dividing a data set into four equal parts. Students then use these five key values — the two extremes, lower quartile, median, and upper quartile — to construct a box-and-whisker plot that displays the distribution of scores along a number line.
Section 1
📘 Stem-and-Leaf Plots, Box-and-Whisker Plots
A stem-and-leaf plot organizes data to show its distribution, while a box-and-whisker plot uses a number line to display key values like the median and quartiles.
This is your introduction to data visualization. In the following examples, you'll practice creating these plots and calculating the statistical measures they are built on.
Section 2
Stem-and-leaf plot
A stem-and-leaf plot organizes data by separating each value into a 'stem' (the initial digits) and a 'leaf' (the final digit). For example, in the key 3 | 2, the stem 3 and leaf 2 represent the score .
1 | 4 8
2 | 1 1 55 | 2 3
6 | 0 8 9Think of it like organizing your music! The 'stem' is the artist (like 20s, 30s), and the 'leaves' are the individual songs. It’s a super quick way to see the shape of your data without losing any of the original numbers. This clever chart sorts all your values by their first digit, giving a fast, visual summary of the whole group.
Section 3
Median
The median of a set of numbers is the middle number of the set when the numbers are arranged in order. Half of the scores are at or below the median score, and half of the scores are at or above the median score.
Imagine lining up your classmates by height. The median is the person standing perfectly in the center—not the tallest or shortest, just the middle! If there's an even number of people, the two in the middle find the average height. The median tells you the true midpoint of your data, ignoring any super-tall giants or tiny friends who might skew the average.
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Section 1
📘 Stem-and-Leaf Plots, Box-and-Whisker Plots
A stem-and-leaf plot organizes data to show its distribution, while a box-and-whisker plot uses a number line to display key values like the median and quartiles.
This is your introduction to data visualization. In the following examples, you'll practice creating these plots and calculating the statistical measures they are built on.
Section 2
Stem-and-leaf plot
A stem-and-leaf plot organizes data by separating each value into a 'stem' (the initial digits) and a 'leaf' (the final digit). For example, in the key 3 | 2, the stem 3 and leaf 2 represent the score .
1 | 4 8
2 | 1 1 55 | 2 3
6 | 0 8 9Think of it like organizing your music! The 'stem' is the artist (like 20s, 30s), and the 'leaves' are the individual songs. It’s a super quick way to see the shape of your data without losing any of the original numbers. This clever chart sorts all your values by their first digit, giving a fast, visual summary of the whole group.
Section 3
Median
The median of a set of numbers is the middle number of the set when the numbers are arranged in order. Half of the scores are at or below the median score, and half of the scores are at or above the median score.
Imagine lining up your classmates by height. The median is the person standing perfectly in the center—not the tallest or shortest, just the middle! If there's an even number of people, the two in the middle find the average height. The median tells you the true midpoint of your data, ignoring any super-tall giants or tiny friends who might skew the average.
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter