'Random' is the cousin of 'coincidence'. If 'random' is the bread, then 'coincidence' is the butter. Both are invorked to explain everything and to understand nothing. They are scientific 'abrakadabras'.
When someone say 'pick up the oranges at random' he insinuate that there isn't any rule that ought to determine what orange you pick and what orange you leave. But then scientists also swear that the world is strictly due to some laws and initial/boundary conditions! So they latter deny on your face that the world is indead random-having explained everything using 'random'!
So 'random' is just a fancy way of saying 'we don't know'. It is an some ignorance hiding in the envelope of knowledge. It gotta be stated 'nature is bewilderingly complex and so we just don't know the causes in question'