申論題

11. (30%) A study show that in an exan the time required to come up with the correct answer for each question is a cont tinuous memoryless random variable with the ex expected value equal to the difficulty level of the question. The time to answer each question is independent of each other.

(d) (6%) In another exarn, there are so many questions s all of ther. Fortunately, all questions in the exam have the same diffculty level 2. Denote s such that it seer ers impossible to finish V as the number of questions answered corrcctly for the exam within the total allowable time of 100 (time units). Write down the PMF of V.