Incorporating feedback from the numerous users of the first edition and the reviewers of the drafts of the second edition, the authors for this revision:

* Updated the examples and data.

* Added two totally new activities, V is for Variation: How Far Are You from the Mean? and The Lazy Student, an activity that explores the spread as random variables are introduced.

* Designed a new look and feel that makes each activity clear, and easier to use.

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