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11,678 trader intern interview questions shared by candidates

1. find me the angle between the hour and minute hand on the old clock if the time is 14:20 2. If my 3 chickens layed 3 eggs in 3 days. How many eggs would 9 chickens lay in 9 days 3. If I wrote down the numbers 1 to 200 on a piece of paper, how many times would the digit 2 appear 4. the probability of raining on saturday is 0.4, and sunday is 0.5: A. What is the probabaility of raining at least once during the weekend if the events are independent B. If there's positive correlation between the days, how will the answer A change C. given that there can be any sort of correlation between the days. tell me the maximum and minimum to the answer of A 5. the value of a treasure chest is worth uniformly distributed between 1-1000. You can bid any price. If the bidding price is lower than the value, nothing happens. If the bidding price is higher than the value, you must purchase ti at the bidding price, and also have the option to resell it at 1.5 times its original value. What is your strategy
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Assistant Trader

Interviewed at Jane Street

4.4★
Oct 7, 2014

1. find me the angle between the hour and minute hand on the old clock if the time is 14:20 2. If my 3 chickens layed 3 eggs in 3 days. How many eggs would 9 chickens lay in 9 days 3. If I wrote down the numbers 1 to 200 on a piece of paper, how many times would the digit 2 appear 4. the probability of raining on saturday is 0.4, and sunday is 0.5: A. What is the probabaility of raining at least once during the weekend if the events are independent B. If there's positive correlation between the days, how will the answer A change C. given that there can be any sort of correlation between the days. tell me the maximum and minimum to the answer of A 5. the value of a treasure chest is worth uniformly distributed between 1-1000. You can bid any price. If the bidding price is lower than the value, nothing happens. If the bidding price is higher than the value, you must purchase ti at the bidding price, and also have the option to resell it at 1.5 times its original value. What is your strategy

We have two urns. You can't tell them apart from the outside, but one has seven $1 chips and three $10 chips, and the other has nine $1 chips and one $10 chip. You randomly draw a chip from one of the urns and it happens to be a $10 chip. Without replacing this draw, I offer you a chance to draw and keep a chip from either urn. Should you draw from the same urn or the opposite urn, and what is the expected value of the chip you draw? Why?
avatar

Quantitative Trader Intern

Interviewed at Jane Street

4.4★
Jan 13, 2021

We have two urns. You can't tell them apart from the outside, but one has seven $1 chips and three $10 chips, and the other has nine $1 chips and one $10 chip. You randomly draw a chip from one of the urns and it happens to be a $10 chip. Without replacing this draw, I offer you a chance to draw and keep a chip from either urn. Should you draw from the same urn or the opposite urn, and what is the expected value of the chip you draw? Why?

You have been chosen to play a game involving a 6-sided die. You get to roll the die once, see the result, and then may choose to either stop or roll again. Your payoff is the sum of your rolls, unless this sum is greater than 9, in which case you "bust" and get nothing. What is your strategy for this game? That is, for each possible outcome of the first roll will you choose stop or to roll again?
avatar

Quantitative Trader Intern

Interviewed at Jane Street

4.4★
Jan 13, 2021

You have been chosen to play a game involving a 6-sided die. You get to roll the die once, see the result, and then may choose to either stop or roll again. Your payoff is the sum of your rolls, unless this sum is greater than 9, in which case you "bust" and get nothing. What is your strategy for this game? That is, for each possible outcome of the first roll will you choose stop or to roll again?

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