Jane Street Interview Question: Compute the expected value of... | Glassdoor.co.uk

Interview Question

Trader Interview

Compute the expected value of the median of rolling the

  dice three times

Interview Answer

4 Answers



By symmetry the median is equally likely to be 3 as it is 4 , equally likely to be 2 as it is 5 and so on. So the expectation of median of 3 rolls is just 3.5 like it is for 1 roll

Anonymous on 5 Jul 2020

No there is no symmetry :)
Expected value is higher

Anonymous on 28 Jul 2020

Actually 3.5 is right, please make sure you are correct before being so smug.

Anonymous on 18 Aug 2020

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