4.25
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Practice and memorization. It may help to memorize the digits in sets, like ten at a time. Here are the first 50 digits if you want to work on memorizing them: 3.141592653 5897932384 6264338327 9502884197 1693993751
The mean deviation of any set of numbers is always zero and so the absolute mean deviation is also always zero.
The first 50 are:3.14159265358979323846264338327950288419716939937510
28%
Have a look at the related link - it shows the first million digits !