Quantitative Research Internship Interview Questions

4,818 quantitative research internship interview questions shared by candidates

There are 100 coins and someone flips them and doesn't tell us the results. I can ask one Yes/No question. After the answer I will start guessing the coin flip results. For each correct guess I get 1 dollar and for each wrong guess I lose 1 dollar. What is the best strategy to play this game and what is the maximum expected value of the return.
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Quantitative Researcher Internship

Interviewed at Jane Street

4.4
Jan 4, 2020

There are 100 coins and someone flips them and doesn't tell us the results. I can ask one Yes/No question. After the answer I will start guessing the coin flip results. For each correct guess I get 1 dollar and for each wrong guess I lose 1 dollar. What is the best strategy to play this game and what is the maximum expected value of the return.

1. 2 players, 30 sided die. A choose the number first and B then choose a different number. The one who choose the number which is closer to the number the die rolls wins the amount (the die rolls) of money. For example, A choose 9, B choose 10, if die rolls 7 then B pay A 7 dollars. Would you like to be A or B? What number would you choose? What is your expected return? Does your strategy depend on you opponent?
avatar

Quantitative Researcher

Interviewed at Jane Street

4.4
Dec 21, 2016

1. 2 players, 30 sided die. A choose the number first and B then choose a different number. The one who choose the number which is closer to the number the die rolls wins the amount (the die rolls) of money. For example, A choose 9, B choose 10, if die rolls 7 then B pay A 7 dollars. Would you like to be A or B? What number would you choose? What is your expected return? Does your strategy depend on you opponent?

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