Trader Interview Questions in Dublin, Ireland | Glassdoor

# Trader Interview Questions in Dublin, Ireland

73

Trader interview questions shared by candidates

## Top Interview Questions

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Mar 13, 2013

Mar 8, 2011
 How many oranges are consumed per year in Ireland?2 AnswersDoes anybody have an answer for this type of logic question? I think I've heard it being phrased, well not phrased, but asked using 'population of uganda' or 'number of dentists in london' or something similar... Can't figure out how you would go about estimating this really Or is there even an answer? Are they just looking to see how you go about answering it?Its all about your thought process. no one cares about what you get but how you got there. For instance 4million in the republic 25% orange eaters ie 1million. Avg of 3 oranges consumed a week . ie 162 per person per year. 162 million oranges.

Jun 9, 2010
 You are the captain of a submarine. You have two torpedoes. Each torpedo hits a ship independently with probability 1/3. What's the probability you will hit a ship?3 AnswersGenerally you get the probability of both happening by multiplying the prob's. Obviously you aren't looking for the probability of both, but you are looking for the opposite probability of both not hitting. So P(Not) = 1 - 2/3*2/3 = 5/9Alternatively the probability of a union of two independent events is given by P(A U B) = P(A) + P(B) - P(AnB), where I use n to represent the intersect. Here the two events are the 1st torpedo hits and the 2nd torpedo hits, and the union of the two events is that you hit the ship (with one or two torpedoes). So P(hit ship) = P(1st hits U 2nd Hits) = 1/3 + 1/3 - 1/3*1/3 = 6/9 - 1/9 = 5/9It'd be better to clarify with the interviewer when asked this type of questions . If the interviewer means ONE ship, we'd also have to subtract the probability of both hitting, therefore: P(Not) = 1 - 2/3*2/3 - 1/3*1/3= 4/9 Also, both previous answers are the same logic. As ( A + B ) = NOT(NOT( A + B )) = NOT( AxB)

Jun 9, 2010
 You are the captain of that same submarine. You can see a sinking ship on the horizon. What's the probability both of your torpedoes hit the ship?4 AnswersTo calculate this, based on the previous probability of 1- P(no hit) = 5/9, we may update this information into the scenario. Essentially something like a bayes rule, knowing that the ship has definitely sunk, you are looking P (both torpedoes hitting| it has sunk) = 1/3*1/3 divide by 5/9, which equals to 1/5.Wouldn't that simply be 1/3? Seeing as the ship is sinking, you already know it's been hit by a torpedo, and as the probabilities are independent of eachother, P(the other torpedo hits)=1/3, no?no, it's a Bayes rule problem of conditional probability. The rule is : prob of event A given event B has happened = (prob of event B given event A)x(prob of event A)/prob of event B in this case, prob of event B given event A is the prob of the ship sinking given both torpedos have his, which is obviously 100%. probability of event A is the prob of both torpedos hitting, which is (1/3)*(1/3) = 1/9 probability of event A is the prob of ship sinking, which we already have as 5/9. so the probability of both torpedos hitting, given the ship is sinking = (1)*(1/9)/(5/9) = 1/5Show More ResponsesIf you know its sinking, then at least 1 hit. So you know there are 5 possibilities (from previous answer of 5/9) for it to have happened. Only 1 of those can be the one where both hit. So, probability is 1/5.

Mar 24, 2015
 I have a painting, if it's an original it's worth 500k if it isn't it's worth 10k. The probability it's an original is 0.2. I have an option to pay 100k for the picture after inspection what is the value of the option?2 AnswersThe payoff of the option is 400k. 400000(0.2) is 80k.Expected value of the painting is 108K (0.2*500,000+0.8*10,000=108,000) but you have to pay 100K for the painting if it's an original, so the option would be worth \$8,000 (I think)

Aug 23, 2012
 Played the game Acey Deucy 1 Answercan you explain the question you were asked and the solution..it has being annoying me since last year!!

Oct 31, 2009
 'If you throw a dice and can choose to take the initial score or roll again and will get \$1 for 1, \$2 for 2 etc, what is the fair price for that game'. 1 Answer4.25 if roll 1,2,3--> roll again b/c below 3.5 expectation so expectation of first roll 50% of time that you keep is 5 b/c (4+5+6)/3 other 50% you reroll and have same 3.5 expectation overall .5x5 + .5x3.5

Apr 18, 2012
 E(V) of one roll of a dice.1 Answer3.5