By Matthew Freeman. This is important.
Normal vs. paranormal distributions
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Toilet Paper Calculator
Maybe you’re starting to run low. Here’s how much you’ll need when you go to restock.
Shifting Incomes for American Jobs
For various occupations, the difference between the person who makes the most and the one who makes the least can be significant.
Percentage of Households in Each Income Level
What percentage of households fall into lower-, middle-, and upper-income levels when you adjust for household size?