There must be a fixed number of trials

- This number of trials is denoted by $n$

Each trial can have only two outcomes

- These outcomes are called
*success*and*failure*

- These outcomes are called
The outcomes of each trial must be independent of each other

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 $q$.

- This probability of