About This Chapter
Proportions, Ratios & Averages - Chapter Summary
In this chapter, you'll review proportions, ratios and averages. Lesson topics include the relationship between ratios and proportions and how weighted averages are measured. You'll also look at the applications of proportions and work on practice problems related to mean, median, mode and range. Completion of these lessons will help you be able to:
- Apply knowledge of proportions to practice problems
- Make calculations with ratios and proportions
- Recall the formula that is used to calculate averages
- Calculate the mean, median, mode and range of data set
- Explain how a frequency table is used
Our instructors, who are all professionals in their field, guide you through these brief yet informative lessons. The lesson quizzes allow you to gauge your knowledge of these topics. The video tags allow you to jump straight to the areas of the lesson that you want to focus on. For a text-based review of these topics, you can use the accompanying lesson transcripts, which include key terms set off in bold print.
1. Ratios and Proportions: Definition and Examples
Watch this video lesson to learn how ratios and proportions are related. Also, learn how ratios and proportions are used in real life and how you can apply them to yours.
2. Proportion: Definition, Application & Examples
When we want to compare one ratio, or fraction, to another equivalent ratio, it's a proportion. Learn all about proportions and practice solving proportion problems in this lesson.
3. Calculations with Ratios and Proportions
Even if only 99 out of 100 people need to know how to work with ratios, the odds that they'll be useful to you are very high. In this lesson, we'll practice performing calculations with ratios and proportions.
4. Identifying & Calculating Averages
After watching this video lesson, you will be able to calculate any kind of average, even the average of certain events when some events repeat. Learn the general formula to use to calculate any average.
5. Calculating Weighted Average: Method, Formula & Example
This lesson will examine the concept of a weighted average and types of situations when it should be used instead of a standard average. It will also give some real-world examples of a weighted average.
6. How to Calculate Mean, Median, Mode & Range
Measures of central tendency can provide valuable information about a set of data. In this lesson, explore how to calculate the mean, median, mode and range of any given data set.
7. Finding Mean, Median & Mode on a Frequency Table
Many times when you are dealing with statistical data, it will be presented in the form of a frequency table. As you'll see in this lesson, frequency tables often take much of the hard work out of analyzing a data set.
8. Calculating the Mean, Median, Mode & Range: Practice Problems
Calculating the mean, median, mode, and range of a data set is a fundamental part of learning statistics. Use this video to practice your skills and then test your knowledge with a short quiz.
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Other chapters within the QTS Professional Skills Test - Numeracy: Practice & Test Prep course
- About the QTS Numeracy Skills Test
- Basic Math Operations & Mental Math
- Fractions, Decimals & Percentages
- Understanding Graphs & Charts
- Interpreting & Analyzing Data Sets
- Units, Measurements & Conversions
- The Mathematics of Money
- Solving Word Problems
- QTS Professional Skills Test - Numeracy Flashcards