Easy · Expected Value & Decision Theory · Numerical · ~3 min · #98

Expected Gap Between Two Dice

Real interview · Jane Street

You roll a fair die twice. What is the expected absolute difference between the two rolls?

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Worked solution

Give the problem an honest attempt first, then reveal the full explanation.

Reported in interviews

Jane StreetGlassdoor interview question
Reported as the expected difference. We ask for the absolute difference, the non-trivial reading.

Candidate-reported and unverified; the firm may phrase it differently or no longer ask it. The wording here is our own paraphrase, and the solution was written and checked independently of any answers posted at the source.

Concepts

CountingExpected value

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