In this simulation, set the number of coin flips per trial to 5, 10, or 20, and the number of heads is recorded. Set the total number of trials (from 1 to 10,000) with a button. When the probability of heads is 50%, the distribution closely resembles a binomial distribution as the number of trials and the number of coin flips per trial increase. Make a weighted coin by changing the probability of landing on heads using the slider; 0% means the coin always lands on tails and 100% means the coin always lands on heads. Click “flip coins” to generate a new set of coin flips. Use buttons to view a bar chart of the coin flips or the probability distribution (also known as the probability mass function). The probability mass function is the number of flips in a trial that resulted in x heads divided by the number of flips.