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An event can occur 0, 1, 2, ... times in an interval. The average number of events in an interval is designated <math> \lambda </math> (lambda). <math> \lambda </math> is the event rate, also called the rate parameter. The probability of observing  events in an interval is given by the equation

An event can occur 0, 1, 2, ... times in an interval. The average number of events in an interval is designated <math> \lambda </math> (lambda). <math> \lambda </math> is the event rate, also called the rate parameter. The probability of observing  events in an interval is given by the equation

一个事件可以在一个间隔内发生0,1,2，... 次。区间内的平均事件数被指定为 < math > lambda </math > (lambda)。Lambda </math > 是事件速率，也称为速率参数。以下方程给出了在一个区间内观测事件的概率

一个事件可以在一个间隔内发生0,1,2，... 次。区间内的平均事件数被指定为 < math > lambda </math > (lambda)。Lambda </math > 是'''<font color="#ff8000">事件速率Event rate </font>'''，也称为'''<font color="#ff8000"> 速率参数Rate parameter</font>'''。以下方程给出了在一个区间内观测事件的概率