Pre-Algebra: Chapter 10, Lesson 2
Measures of Variation
Definitions:
RANGE: The range of a set of numbers is the difference between the least and the greatest number in the set.
MEDIAN: The middle number in a given data set. IF there are 2 numbers (that is the number sequence has an even number of numbers), then the median is the average of the 2 middle numbers. Add the 2 numbers together and divide by 2!
QUARTILE: The division of a data set into 4 equal parts. There are 2 quartiles we will worry about, the lower quartile (LQ) and the upper quartile (UQ)
INTERQUARTILE RANGE: The interquartile range (IQ) is the range of the middle half of a set of numbers. In equation form, the IQ =UQ – LQ
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Algebra: Chapter 10, Lesson 12
Reasoning Strategies
You can use the following strategies on the reasoning strategy problems in this lesson!
- Draw a diagram
- Make an organized list
- Look for a pattern
- Try, test and revise
- Use logical reasoning
- Simplify the problem
- Write an equation
- Make a table
- Work backward