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 Challenge
 Set:  A collection of numbers, geometric figures, letters, or other objects that have some characteristic in common.

Without Blue or Brown: How many students have a particular color of hair and eyes in a class of 30 students?

Taking Classes: Given certain parameters, how many students can possibly be taking math and English, science and English, and math and science?

Mean, Median, and Mode: Is One Always Larger?: Compare the relative size of different measures of center in various data sets.

Combining Data Sets: Examine changes in measure of center when you combine groups of data.