Method pickFromDistribution

Picks a random item from an array of probabilities, normalized and summed as follows: For example, if four probabilities are {0.3, 0.2, 0.1, 0.4}, then they should get normalized and summed by the outside owners as: {0.3, 0.5, 0.6, 1.0}. If probabilities.length < CH

(final float[] probabilities,
        final float prob)