**Morgan Stanley Interview Questions **by Anirban Bhattacharyya, Indian Statistical Institute

**Position:** Fixed Income Division Intern

**Process:** Aptitude test followed by four rounds of interviews

**Aptitude Test:**

This was an online test consisting of several sections. The test lasted for 2 hours. There was a time limit for each section, and I had to answer all the questions from each section. The positive thing was that there was no negative marking.

The sections were: English Comprehension, English Speaking, English Writing, Mathematical Aptitude, Mathematical Reasoning, Finance, and lastly one-two Coding Questions. The coding questions were typical algorithm and data structure questions which can be easily found in Leetcode or similar websites.

Based on the performance in the aptitude test, I was selected for the Interview Round.

**Interview Questions:**

**Round 1:**

- Walk me through your resume.
- Describe the projects in your resume. I described my two best projects.
- Explain LDA and QDA. Do you know about SVM?
- You have two independent uniform random variables with support [0,1]. What is the probability that the squared sum of them is less than 1?
- Suppose you are playing a game. Both the players toss a coin independently. The player who gets head first time wins otherwise the game continues. What is the probability of winning for the player who starts the game?
- You have three boxes, each containing 2 coins. The first box contains two gold coins, the second one contains one gold and one silver and the third box contains two silver coins. You draw a box randomly. What is the probability that the second coin of the box is gold given the first coin is gold?
- Given a number, how can you reverse the number? Tell me the code in your preferred language.
- What is a bond? Some problems related to compound interest and mental calculation

**Round 2:**

- Tell me about yourself.
- What makes you choose Morgan Stanley?
- Do you have any questions for me (the interviewer)?
- What is a percentile? An easy problem using percentile.
- Suppose you have a 3*3 matrix and you have numbers 1 to 9. You have to place the numbers in that matrix in such a way that each row sum and each column sum and two diagonal sums are equal. How can you do that?
- Try to break the above problem into some simpler subproblems. Then solve those first.

Result: Cleared both the rounds.

**Round 3: (HR Round)**

- Tell me about yourself and Why Morgan Stanley?
- What are your strengths and weaknesses?
- Tell me a situation where you were in a moral conflict?
- What are the qualities of a leader?
- Suppose at the end of your internship you suddenly realized that the work you have done so far has some serious calculation mistakes. The work is already given to clients. What will you do?
- (I answered I’ll let my manager know and figure things out. This is a follow-up question.) Suppose your manager tells you to just keep quiet. In that case, your clients will suffer. What will you do in this situation?

**Round 4: (Another Round where the division head talked to me)**

- What is your rank in your batch? What subjects you had in the last semester and marks?
- Why are you opting for a job internship? Why not Ph.D.?
- Any questions for me?

Result: After waiting for 1 hour, the result came. I was selected!

**Some resources:**

Here are some resources. Most of them contain questions typically asked in job interviews. Hope it helps.

- https://www.nicksingh.com/posts/40-probability-statistics-data-science-interview-questions-asked-by-fang-wall-street
- https://puzzles.nigelcoldwell.co.uk/
- https://www.brainstellar.com/puzzles/
- https://github.com/adijo/data-science-prep

**Books: **

- 40 Puzzles and Problems in Probability and Mathematical Statistics by Wolfgang Schwarz
- Fifty Challenging Problems in Probability with Solutions by Frederick Mosteller

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