well, yes, that was what i am thinking.
It might be i switch the miner on one morning and BANG solved one Block without having
much GH/s or long time.
It is a statistic value wich makes the calculation of time and GH/s.
The other factor is the "blind chicken" factor named Luck
if i will be that one or not.
When i first heard of Bitcoin mining i thought it is a purley math by calculating in cryptography thing.
That sound intresting to me and attracted me to look after it.
Now it is pointed out to be as DrHaribo's description i also found a couple of weeks ago.
The Lottery ticket handout.
Anyway it is now clear and thank all for clearing this up.