Quantitative Research Internship Interview Questions

3,500 quantitative research internship interview questions shared by candidates

2 Medium programming questions and 1 Easy; probability multiple-choice problems for the closest number with time limit 90 seconds each; find the next element in a sequence of numbers; mini-games testing reaction time and logical thinking.
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Quantitative Researcher, PhD Intern

Interviewed at Optiver

3.8
Jul 23, 2025

2 Medium programming questions and 1 Easy; probability multiple-choice problems for the closest number with time limit 90 seconds each; find the next element in a sequence of numbers; mini-games testing reaction time and logical thinking.

An ant leaves its anthill in order to forage for food. It moves with the speed of 10cm per second, but it doesn't know where to go, therefore every second it moves randomly 10cm directly north, south, east or west with equal probability. If the food is located on east-west lines 20cm to the north and 20cm to the south, as well as on north-south lines 20cm to the east and 20cm to the west from the anthill, how long will it take the ant to reach it on average?
avatar

Quantitative Researcher

Interviewed at Optiver

3.8
Oct 13, 2024

An ant leaves its anthill in order to forage for food. It moves with the speed of 10cm per second, but it doesn't know where to go, therefore every second it moves randomly 10cm directly north, south, east or west with equal probability. If the food is located on east-west lines 20cm to the north and 20cm to the south, as well as on north-south lines 20cm to the east and 20cm to the west from the anthill, how long will it take the ant to reach it on average?

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