If there are JUST four outcomes of the experiment, it's invalid. Because .1+.15+.4+.2=.85, which is not equal to 1.
This is beacuse since the experiment has occurred, the possibility of getting an outcome, which equals the sum of all four kinds of outcomes' possibilities, should be one.
Answer: Increase in number or size, at a constantly growing rate. It is one possible result of a reinforcing feedback loop that makes a population or system grow (escalate) by increasingly higher amounts.
