Junior Trader Interview Questions

9,642 junior trader interview questions shared by candidates

During the third interview : imagine an infinite chess board. If the horse from 1 case, in how many cases can he possibly ends after 10 moves. You actually don't have to give a number but a 95% confidence interval. pen and paper allowed
avatar

Junior Trader

Interviewed at Jane Street

4.4
Mar 1, 2012

During the third interview : imagine an infinite chess board. If the horse from 1 case, in how many cases can he possibly ends after 10 moves. You actually don't have to give a number but a 95% confidence interval. pen and paper allowed

You have a dart board thats split in half. If you hit the left half, you get 2 points, if you hit the right half, you get 3 points. If you have an 80% chance of hitting the dart board on any given throw and a 70% chance of hitting the side you're aiming for (given that you hit the dartboard so a 30% chance you hit the side you aren't aiming for), if you have an unlimited number of throws, what's the probability you get a score of exactly 7
avatar

Assistant Trader

Interviewed at Jane Street

4.4
Mar 3, 2014

You have a dart board thats split in half. If you hit the left half, you get 2 points, if you hit the right half, you get 3 points. If you have an 80% chance of hitting the dart board on any given throw and a 70% chance of hitting the side you're aiming for (given that you hit the dartboard so a 30% chance you hit the side you aren't aiming for), if you have an unlimited number of throws, what's the probability you get a score of exactly 7

Two dice - one 10 sided one 6 sided. Guess the roll of the two dice, no penalty for guessing under. You receive the amount on the dice if you guess it. What is the expected value? What is the bet that would maximize your payout?
avatar

Assistant Trader

Interviewed at Jane Street

4.4
Feb 22, 2014

Two dice - one 10 sided one 6 sided. Guess the roll of the two dice, no penalty for guessing under. You receive the amount on the dice if you guess it. What is the expected value? What is the bet that would maximize your payout?

The only difficult question I was asked went as follows: "You and your opponent flip a coin. If the first player gets heads, the second player pays him $30. If he flips tails, the coin goes to the second player. If the second player flips heads, he wins $30 from the first player. How much should you pay to go first?"
avatar

Quantitative Trader - Intern

Interviewed at Jane Street

4.4
Oct 1, 2015

The only difficult question I was asked went as follows: "You and your opponent flip a coin. If the first player gets heads, the second player pays him $30. If he flips tails, the coin goes to the second player. If the second player flips heads, he wins $30 from the first player. How much should you pay to go first?"

Two people painting a house, one on his own takes 1hr and the other takes 2hrs, how long does it take for both to paint the house. After my answer he asked how confident I was then said that I could bet on my answers, £1 if I got it right, -£1000 if I got it wrong - should I take the bet.
avatar

Full Time Trader

Interviewed at Jane Street

4.4
Jun 29, 2012

Two people painting a house, one on his own takes 1hr and the other takes 2hrs, how long does it take for both to paint the house. After my answer he asked how confident I was then said that I could bet on my answers, £1 if I got it right, -£1000 if I got it wrong - should I take the bet.

100 coins in a circle, clockwise labeled 1-100. Starting at coin 1, you flip each one moving clockwise. If a coin lands tails, you keep it, if it lands heads, you remove it. After a long time, only one coin will remain. What would you expect its label is?
avatar

Trader Intern

Interviewed at Jane Street

4.4
Aug 22, 2015

100 coins in a circle, clockwise labeled 1-100. Starting at coin 1, you flip each one moving clockwise. If a coin lands tails, you keep it, if it lands heads, you remove it. After a long time, only one coin will remain. What would you expect its label is?

Viewing 21 - 30 interview questions

Glassdoor has 9,642 interview questions and reports from Junior trader interviews. Prepare for your interview. Get hired. Love your job.