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Answer In probability theory, the expectation of a random variable is the weighted average of all possible values that this random variable can take o ...
General Questions | dice roll probability dice All
Question: You are playing a roulette game in a casino. But unlike a normal wheel, you are lucky enough to stumble upon a promotional wheel that has b ...
Interview Puzzles | casino game roulette spins probability All
Question "Let's play a game of Russian roulette*", begins one interview stunt that is going the rounds at Wall Street investment banks. "You are tie ...
Interviewed for position: Program Manager, SDE, Test, Analyst
1 Answer 
Interview Puzzles | roulette probability chance play bank All
"You flip a fair coin 20 times in a row and it comes up heads every single time. You flip the coin one more time. What is the probability of tails on ...
Technical Questions | probability All
Full question:

Suppose you're on a train that has 1 to 100 carts. Given you are in fifth cart, what's the expected number of the carts?
Company where asked this question: CSFB
Interviewed for position: quant jobs
Interview Puzzles | probability All
If the probability of observing a car in X minutes on a highway is P, what is the probability of observing a car in X/N minutes (assuming constant def ...
Company where asked this question: Google, Microsoft
1 Answer 
Interview Puzzles | probability car all All
It is known that a certain family has two children, at least one of whom is a boy. What is the probability that there is a girl child in that family? ...
2 Answers 
Interview Puzzles | probability puzzle all All