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Problems, Questions, and Puzzles to spark discussion and argument in the maths classroom.

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My employer has nine workers. The nine of us want to determine what our average salary is, but none of us wants to divulge his own salary. Can we find the average without doing so?


.: [STATS], [Futility Closet], [Create a Problem].

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If the proportion of blonds among blue-eyed people is greater than among the population as a whole, is it also true that the proportion of blue-eyed people among blonds is greater than among the population as a whole?


.: [ALL], [Futility Closet], [Understandings].
that's it.