Statistics › Section E · Continuous random variables › Topic E.3
The exponential distribution
The Poisson topic counted events in a window; this topic measures the gaps between them. When events occur randomly at a constant rate, the waiting time for the next one follows the exponential distribution - the continuous twin of the geometric.
In this topic
- Waiting for the next event
- The exponential model and its rate
- The survival formula
- Memorylessness
- The Poisson connection
- Worked example: the help desk's gaps
- Worked example: the fresh-copy property
- Percentiles and the median
- Common mistakes to avoid
- Key takeaways
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