Junior Quantitative Analyst Data Analyst Interview Questions

8,218 junior quantitative analyst data analyst 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.

Google the game 'Shut the box'. He asked me to figure out the average score someone has at the end of the game if they play the 'optimal' strategy. After getting this number, he wanted to know how this would change if instead of playing the optimal strat, they made random moves. Super open ended problem.
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Quantitative Trader

Interviewed at Jane Street

4.4
Mar 29, 2019

Google the game 'Shut the box'. He asked me to figure out the average score someone has at the end of the game if they play the 'optimal' strategy. After getting this number, he wanted to know how this would change if instead of playing the optimal strat, they made random moves. Super open ended problem.

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