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Normal Distribution & Time Constant Values

Normal Distribution:

Mean +/- 1 Standard deviation includes 68.27 % of values

Mean +/- 2 Standard deviation includes 95.45 % of values

Mean +/- 3 Standard deviation includes 99.73 % of values

Time Constant:

In 1 time constant 63 % of process completed.

In 2 time constant 86.5 % of process completed.

In 3 time constant 95 % of process completed.

If you have difficulty remembering the above and are willing to accept about a 3 % error , try remembering these figures. Something better than nothing !

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