What is this number and where does it come from?

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What is this number and where does it come from?
If you go to your following link: https://www.callcentrehelper.com/erlang-c-formula-example-121281.htm
In part 12, there is the number of 0.6821 - what is this number and where does it come from?

Helper

Call Centre Helper

It was missing an equals sign
So Pw = X / ( Y + X)

Pw = 27557 / (12842 + 27557) = 0.6821

Or in percentage terms 68.2%

I have corrected the original article

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