# A-level Mathematics/MEI/S1/The Binomial Distribution

< A-level Mathematics‎ | MEI‎ | S1
1. The event must have only two possible outcomes.The outcomes are normally termed as 'success' ( denoted by ${\displaystyle p}$ ) and failure ( denoted by ${\displaystyle q}$ )
If an event is to be repeated ${\displaystyle n}$ number of times with constant (independent) probabilities of both the possible outcomes occurring, by calculating the mean (${\displaystyle n*p}$ ) of the distribution and the variance ( ${\displaystyle n*p*q}$ ) of the distribution, the binomial distribution can be converted into an approximate normal distribution.