The 4 Characteristics of a Binomial Experiment

1. There must be a fixed number of trials

• This number of trials is denoted by $n$
2. Each trial can have only two outcomes

• These outcomes are called success and failure
3. The outcomes of each trial must be independent of each other

4. The probability of a success must remain the same for each trial

• This probability of success is denoted by $p$.
• This, of course, forces the probability of failure to remain the same for each trial as well, which we denote by $q$.