I do believe in coincidence as these things are simply a confluence of choices made by individual actors. I don't believe it's a matter of chaos verses order. Why must coincidence and order be mutually exclusive? I think it's more like actions or choices have resultant consequences, either negative or positive. These consequences may not be equal in every respect or within a particular time frame but they will come to fruition and be either negative or positive according to the nature of the associated action. An action of one sort can be expected to have a consequence of the same sort, either negative or positive.  One always follows the other.

In other words "Whatsoever a man sows, that also shall he reap." This is what is "determined". I don't believe that the divine interferes with volition. If he did then it wouldn't be volition and love would be meaningless and so would life itself since, the actors would simply be playing their predetermined parts. 

The parameters have been set but the actors are still able to move within those parameters from one end of the spectrum to the other. Choices have consequences and choices made by one actor will coincidentally intersect from time to time with choices made by other actors. The parameters remain constant. We don't have to wonder why some random thing may have happened to us because within the parameters of the material universe this thing, whatever it is, can be expected as it is a thing that has resulted from someone's choice or choices. "The rain falls on the just and the unjust alike" does it not and this random thing, while being unexpected at the time, is certainly something which is common to all mankind and to be expected?

Thirty years ago my two year old daughter drowned. If you examine everything that led to her drowning it is all a culmination of the choices made by different actors on that day. Did God allow this or cause this to happen to teach my wife and me a lesson? No, absolutely not! In a fallen world, accidents happen. The important thing in this is what was or should our reaction or attitude to this accident have been and what did we learn? Did we learn that God's grace is sufficient? Yes we did and yes, we can learn from anything and everything that happens to us in life but that does not mean that God or some other force is causing it but only that we should use it to learn and grow into the full stature of the mind of Christ, for those who are believers or for those who are not, into their "authentic self" as someone else commented above.