Hello.
I have few (meyby noob) Q, but I would like to understand .

1. How is reward from hash calculated? I mining last 3 day. Avg h/s is 280 H/s (24h). I was expecting something around 0.0143, but I only have 0.0117 [20+-% less]. Why is it like that?
Previous post was written something about maitenens, but i don't thing this ist the reason. Can anyone explain it to me please? +How i can calculate result correctly?
(i know cca 300H/s is low, but i only testing before start something bigger)


2. Why has PPLNS better rewards? When block is found, it has 100% value. 100% value is divided between miners. How is possible the system PPLNS get more like 100% value in long time? It is always 100%. Now, after year, two ... So where is catch or from where it's stolen ?

3. I try find difference between payout (Wallet) and payout (Exchange), but unsuccessful. All go to my wallet, so what's the difference?

Again sorry for this easy Q.
And thx for answer