text: binomial distribution? is binomial distribution only describe ture experiments? wt about the natural experiment? the binomial distribution can describe both ture and natural experiments. a natural experiment occurs when your dog knocks over your jar of coins, and some of the coins land heads up and some tails up. if your dog does this many thousands of times, most of the time the coin distribution will be close to 50% heads and 50% tails, but hardly ever exactly 50% if you have lots of coins. but on some days you will get 75% heads and 25% tails, of course much less frequently than close to 50%. the binomial distribution describes the number of days that you will get each different kind of heads-tails outcome.  as for ture experiments, you are on your own.