How many questions do they usually ask at prop trading firm interviews?

I just had an interview with a top prop trading firm. It was a probability and statistic interview (the first phone interview after OA). I was interviewing for an internship position (quantitative trading).

I did 2 questions, then there is a follow up to the second question, which I need A LOT of hints to actually solve. They ended the interview early with only 2 questions. 

What do you think is my chance of getting to the next round? I am new to quant interviews, but I assume a normal quant interview (probability and statistics) would probably have more than 2 questions (5-6 perhaps), and they probably cut it short because they realize I'm not good enough (yet!).

Is this true? Any input would be appreciated!

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