http://www.coincalc.com/

[Steve's note: This seems like a wonderful way to start a discussion
about statistics, surveying, and sampling...]

Most of us have a jar in our house full of loose coins...Ever wonder
how much money that jar is worth? CoinCalc.com will help you figure it
out.

Just grab a representative handful of coins and fill in the values
below along with the total weight of your jar.

[This text taken from the website]


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