Find percentiles in normal models - exam decision
A normal manufacturing quality check model has mean \(70\) and standard deviation \(10\). The 80th percentile has \(z=0.84\). Find the percentile value. 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.