6th Grade Math Textbook, Fundamentals

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Identify the outlier in each data set. Then find the mean, median, and mode
for the data set both with and without the outlier.

1.2, 7, 13, 5, 13, 32 2.8, 9, 8, 10, 41, 10, 9, 9 3.0.3, 0.8, 0.8, 0.5, 3.9, 0.8, 0.8, 0.9

4.Discuss and Write How does an outlier affect the mean, median, mode,

and range of a data set?

Lesson 8-3 for exercise sets.

Statistics that indicate how data are spread out or distributed are called

or. The range is one kind

of description of how data are spread out. It is not a measure of central

tendency because it does not represent the data values.

Sets Aand Bbelow have the same range but different means, medians,

and modes.

• Set A: 4, 12, 25, 36, 40, 41, 41, 44 Mean: 30.375 Median: 38 Mode: 41
  44  4  40 range


• Set B: 27, 28, 28, 29, 30, 50, 67 Mean: 37 Median: 29 Mode: 28
  67  27  40 range

You can use the measures of central tendency to make estimates.

Below are some examples.

• DVD rental services pay close attention to customer preferences.
  They can estimate how many of each DVD to keep in stock by
  using the modeto order the movies people see most often.


• Statisticians use the medianto compare how the prices of houses
  change from year to year or over a period of years.


• Teachers use the meanscore on quizzes and tests to evaluate a
  student’s performance over a period of time.

measures of dispersion measures of variation

Organize Data in Spreadsheets

You can use a to organize and analyze

data. Spreadsheets contain numbered rows and

lettered columns. A cell is where a row and a

column intersect.

What is the value of cell C4?

What does that value represent?

The value in cell C4 is 10.7. It

represents the mean number

of DVDs, in thousands, rented

per month in 2006.

spreadsheet

column

cell C4

row