When a teacher asks a question, a student has a probability of 0.4 of being asked. Assume the occurrence is independent. What is the mode of the number of questions raised by the teacher it takes for the same student to be asked 2 questions?
I am stuck at solving this problem. I tried to identify the distribution of the random variable first and I am thinking that it follows a negative binomial distribution, but I am unsure. Please give me hints on how do I proceed with this.