Q138 · Practice questionTechnology-activeSimple familiar2 marks
QUESTION 138 (2 marks)
Let . Determine the 90th percentile of , to one decimal place.
WORKED SOLUTION
2 marksPractice marking scheme
ANSWER
approximately.
Worked solution
The 90th percentile of the standard normal distribution is . Hence .
Uses the correct standard-normal quantile.
Transforms back to the scale correctly.
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