# DB: Module 4 Practice Tests Chapters 8 & 9: Post your Math questions from chapter 8 & 9 on

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You are required to post (at least) **one question and its solution** either from **Chapters 8 & 9 Practice Tests** posted under **the modules**, or any source of your choice (**per ****grading policy in the syllabus**). You must read all the posts and make sure not to duplicate any questions; similar questions are acceptable.

Read all the posts: questions and solutions posted by others first, and pick a different question to post (No duplication is allowed). A question with **One-word solution, One-line solution, or Definition** **is not acceptable and results in ZERO Points for the post **. **(10 points)**

Write the question number and copy down the question

**Show all steps using the math equation editor or embed an image solution as explained below.**

Find a similar problem online, or on YouTube, or Khan Academy and post the link. **(5 points)**

Comment on (Explain) at least one classmate question that is either solved or is found online and posted by watching it carefully in its entirety. **Explain about what the question addressed and what you learned from it and outline a few steps you learned as a result; a compliment is nice but is not a comment. To receive credit for this part, write the name of your classmate. ****(5 points)**

**Example of a Student Post (Made up example):**

**1. Question** 15: **Find the mean, median, mode, and range for the following Population list: **13, 18, 13, 14, 13, 16, 14, 21, 13

**Solution: ๐=โ๐ฅ๐=13+18+13+14+13+16+14+21+139=9**

The median is the middle value, so rank the data first: 13, 13, 13, 13, 14, 14, 16, 18, 21

Population size: N = 9, so the middle value will be the (9 + 1) รท 2 = 10 รท 2 = 5th number:

**13, 13, 13, 13, 14, ****14, 16, 18, 21** โน๐๐๐๐๐๐=14

The mode is the number that is repeated more often than any other: โน๐๐๐๐=13

๐ ๐๐๐๐๐ =๐๐๐ฅโ๐๐๐=21โ13=8

**2. Similar Question found on YouTube:** **Find the mean, median, mode, and range**

https://www.youtube.com/watch?v=k3aKKasOmIwLinks to an external site.

**3. Comment** on question by **John Doeโs** YouTube post:

This post was about finding the **Z Scores**; they represent number of standard deviations away from the mean. A positive Z-score indicates a score which is above the average score in class. A negative Z-score indicates a score which is below the average score in class. A zero Z-score indicates a score equal to the average score in class.

https://www.youtube.com/watch?v=1yYCyAwg-7gLinks to an external site.

**Grades: **A positive Z Score represents a grade greater than the mean (average) grade in class. A negative Z Score represents a grade smaller than the mean (average) grade in class. A zero Z Score represents a grade that is equal to the mean (average) grade in class.

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#### Please refer to the following instructions for โHow to Embed an Image in Canvas Discussionโ for help.

#### How to Embed an Image into a Canvas Discussion Board โ YouTubeLinks to an external site.

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