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Quantitative Research Internship Interview Questions

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3,500 quantitative research internship interview questions shared by candidates

Given deck of cards A and deck of cards B, which deck would you rather choose from if you need to choose two cards of the same color on consecutive draws? Deck A is a normal 52 card deck, Deck B is a 26 card deck with 50% black and 50% red. What if we add deck C, which is a 26 card deck that comes from a random subset of deck A?
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Quantitative Researcher

Interviewed at Jane Street

4.4★
Oct 17, 2015

Given deck of cards A and deck of cards B, which deck would you rather choose from if you need to choose two cards of the same color on consecutive draws? Deck A is a normal 52 card deck, Deck B is a 26 card deck with 50% black and 50% red. What if we add deck C, which is a 26 card deck that comes from a random subset of deck A?

The question they asked me at the end: Suppose there are 10 lions and a meat. If anyone of the lions eats the meat, she falls asleep. While she is sleeping, any other lion can eat her and also fall asleep. And so on. The question is, what will happen at the beginning? Will any lion eat the meat?
avatar

Quantitative Researcher

Interviewed at Citadel

4★
Jan 28, 2021

The question they asked me at the end: Suppose there are 10 lions and a meat. If anyone of the lions eats the meat, she falls asleep. While she is sleeping, any other lion can eat her and also fall asleep. And so on. The question is, what will happen at the beginning? Will any lion eat the meat?

given a series of real numbers, what's the optimal point in real line that minimize the distance between all these numbers? follow up: what's the best algorithm to calculate the median of a sequence of numbers? follow up2: design a algorithm able to update the median of sequence as there are new numbers coming in.
avatar

Quantitative Researcher

Interviewed at Citadel

4★
Oct 31, 2018

given a series of real numbers, what's the optimal point in real line that minimize the distance between all these numbers? follow up: what's the best algorithm to calculate the median of a sequence of numbers? follow up2: design a algorithm able to update the median of sequence as there are new numbers coming in.

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