For example is the Lottery, ERNIE or a throw of dice totally random.
I believe Ernie uses something called a random number generator which over a great deal of time will begin to show patterns of numbers.
The lottery machines can be predicted as to which balls will come out if you could work out all the maths involving air flow, speed of rotation, weight of each ball, diameter of tube etc.
As for dice, there is a one in six chance of throwing the number of your choice. (1-6)