How old is the quarter coin

Territories Quarters Program. Penny Nickel Dime Half Dollar. Skip navigation. Your browser is out of date. For the best and most secure experience in our catalog, please update your browser. Shop Shop. About News Learn. A list of linkable tags for topics mentioned on this page. Here is my scatter plot for the fraction of coins vs. I have two values for each year bin - one for nickels and one for pennies.

Finally, I am only going to look at coins from and earlier. That way I don't have to worry about a lack of new coins. For coins earlier than , they mostly get more rare the older you go. Ok, here is my plot with a fitting function. Don't worry. I know this whole fit is likely to be totally bogus. That has never stopped me before, so why should it stop me now?

From this, I can get a probability of finding a pre coin of each year with this function:. Here P is the probability and t is the age of the coins in years. From this, I can get a probability of finding a quarter. I would just put in an age of 34 remember, this is measured from the year This gives a probability of 0.

That's not too bad - a 4 percent chance. Of course, this assumes all of my quarters are before But I can fix this. From my coin data above, 0.

This means that of all coins, there is a 0. But wait. It's even better. What if I find a quarter? Or a quarter? I could integrate the probability function over all ages from infinity to - or I could just do it as a super simple python program. For years up to age 60, this gives a probability of 0. That seems super high to me. If I look at my data on pennies, it doesn't reflect that. Oh well. Really, I am just wasting my time because I'm upset that I didn't find any silver quarters. See our National Park Quarter inventory.

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