Calibration quiz

Are your 90% intervals really 90%?

Quant interviews often ask for a range you are 90% sure about. This quiz shows whether yours are honest.

How it works

10 questions with one known numeric answer each. None of them is about a company.
For each, give a low and a high bound so you are 90% sure the true value is inside.
If you are well calibrated, about 9 of your 10 intervals will contain the truth.
Everything runs in your browser. Your answers are not sent anywhere.