Test a Poisson mean - official syllabus scenario
Read the official-HL feature being tested first. A library system tests a Poisson mean with \(H_0:\lambda=5\), sample mean \(\bar x=5.55\), and \(n=36\). Calculate the z statistic. 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.
Write a full answer
Now write the response in full, in your own words — this is what the exam asks for. The AI marks it on the same moves you built above (focus, evidence, technique, judgement) and gives feedback on reasoning, evidence, and expression.