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- NZ Year 9 Maths
- Data and Graphs

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Try reviewing these fundamentals first

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Get Started NowStart now and get better maths marks!

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Get Started Now- Intro Lesson: a2:58
- Intro Lesson: b3:29
- Lesson: 1a0:38
- Lesson: 1b0:53
- Lesson: 1c0:37
- Lesson: 2a0:54
- Lesson: 2b1:12
- Lesson: 2c0:44
- Lesson: 3a3:35
- Lesson: 3b2:35

In this lesson, we will learn:

- Analyze the Frequency Table
- Understand the Dot Plot
- Convert a Frequency Table Into a Dot Plot

- Frequency table: a table showing the data values and their corresponding frequencies.
- Dot plot: a simplified version of a histogram. Each dot represents a value in that particular category.
- Dot plots are not the same as scatter plots:
- Scatter plots have a set of axes whilst dot plots do not.
- Each dot in a dot plot has a value of 1. As for a scatter plot, we need to refer to the axis for the value of a dot.

- Introduction
__Introduction to Frequency Tables and Dot Plots__a)What is a Frequency Table?b)What is a Dot Plot? - 1.
**Analyze the Frequency Table**

Stephen is doing a questionnaire about what movie genres his classmates like and he has made the following frequency table:Movie genre frequency Comedy 4 Action 1 Horror 7 Sci-fi 2 Thriller 6 a)How many students like horror movies?b)If each student could only pick one genre and all students voted, how many students are there in the class?c)What is the range? - 2.
**Understand the Dot Plot**

The following dot plot shows the number of student(s) who showed up to a daily meeting:

a)How many students were there on Tuesday?b)What is the range?c)How many students showed up during the first 3 days? - 3.
**Convert a Frequency Table Into a Dot Plot**

The below data set shows the average number of subjects each student takes.

4 6 3 3 4 1 3 2 7 4 7 1 3a)Reflect the data set on a frequency table.b)Convert the frequency table from (a) to a dot plot.