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Brain Teasers : Blue Forehead Room Brain Teaser

By: Sal Khan

What happens when 100 perfect logicians have to figure out if they each have a blue forehead?

Random logic puzzles and brain teasers. Fun to do and useful for many job interviews!

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Brain Teasers : Liar Truth-teller Brain Teaser

By: Sal Khan

How to get correct advice when you can only ask one question from either a liar or a truth-teller (when you don't know who is what)

Random logic puzzles and brain teasers. Fun to do and useful for many job interviews!

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Box-and-whisker plots : Example: Range and mid-range

By: Sal Khan, Monterey Institute for Technology and Education

Range and Mid-range

Measures of central tendency and dispersion. Mean, median, mode, variance, and standard deviation.

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Brain Teasers : Blue Forehead Room Solution

By: Sal Khan

Do not watch before Blue Forehead Room. THIS IS THE SOLUTION!

Random logic puzzles and brain teasers. Fun to do and useful for many job interviews!

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Variance and standard deviation : Statistics: Alternate Variance F...

By: Sal Khan

Playing with the formula for variance of a population.

Measures of central tendency and dispersion. Mean, median, mode, variance, and standard deviation.

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