Day 127

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!

  1. Draw a diagram
  2. Make an organized list
  3. Look for a pattern
  4. Try, test and revise
  5. Use logical reasoning
  6. Simplify the problem
  7. Write an equation
  8. Make a table
  9. Work backward

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