IB skill practice

Model counts with the Poisson distribution

Use Poisson probabilities and expected rates in applied count models.

Paper 1, Paper 2 5 marks Difficulty 3

Model counts with the Poisson distribution - interpretation demand

A regional clinic receives incidents according to a Poisson model with mean \(\lambda=3\) per interval. Find \(P(X=2)\). This version asks for the same mathematical quantity after confirming the method from the context. Enter the requested value and choose the interpretation that matches the result.

Worked practice: result and interpretation

Calculate the requested result first, then choose the interpretation that follows from it.