How lucky are we?

"Such a bad day for me", "unfortunately", "Aah! just missed the chance, it's not in my luck".........These are and so many other lines which we listen and say almost everyday. If I am too much negative, then we also hear "What a luck, Yes!!", "It's my day today", and so many others.
But what is this luck? Does it really exist ? and if yes can we change it?

Many people give many definitions of luck. I have also mine. Many even say , that luck doesn't exist, it's all in your hands. May be, may be not. For the time being let's assume luck exists, (but I will also try to prove it exists). Now if it exists, can we change it? How much control do we have on it? It all lies in the definition of luck you believe in.

I give you my definition. Luck is a series of events, cause for an event, effect of an event, which cannot be controlled by us. The control may be zero percent or very little may be 10-15 percent. But if our control on those events is more than 40%-50% then i won't call that luck.I will explain you these events by some examples. Take the very basic case of you are driving your car. Here you can't control that your car wheels encounters a sharp object and get flat. It's probabilistic which changes each second. Or you are going to office and you meet a traffic jam, you just can't govern it. In my life i have seen many machine-less roads, full of machines, when i need the time most (Sheer bad luck!!). It's all luck because you have no control over it. You can't check each centimeter of road to get saved from a puncture.

I am a firm believer in Darwin's theory that random things go in nature. Similarly luck is a collection of those random events happening in nature, and you call it luck because they have an effect on you. You can't detect and correct randomness, and hence that is luck.

If you have a cricket match today, and it rains then that's your bad luck. You can't change the chances of rain. Only those things are in your hand which you can control, but as luck is not controlled by you hence you can't change it.

So I say luck exists, because there are always some randomly generated, not controlled by us events occur with some controllable event. Like you are preparing for an interview.

Here

Controlled event: Your preparation.
Assumption: You can't prepare everything.
Uncontrolled event (Luck): What interviewer will ask?

The above scenario can be made totally controlled by you if you can prepare each and every question asked by interviewer. But that's very hard to achieve so you need luck.

So I believe luck cannot be controlled by us, because then it won't be luck.
And how lucky we are depends , how many times the uncontrolled events are in our favor?