10. The number of students who fail per semester is often modeled as a Poisson random variable. Assume that on the average there are 6 students who fail per sem.  d. If exponential distribution can model this system, what is the probability that there will be no failing students right after midterm? Let X denote the time in semesters from the start of the interval until the first failure and that a semester is divided by midterm period. e. Calculate the probability that there will be a failing student within the first semester. f. Calculate the probability that a failing student will be first spotted after midterm up to end of the first semester?

A First Course in Probability (10th Edition)
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Chapter1: Combinatorial Analysis
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10. The number of students who fail per semester is often modeled as a Poisson random variable. Assume that on the average there are 6 students who fail per sem. 


d. If exponential distribution can model this system, what is the probability that there will be no failing students right after midterm? Let X denote the time in semesters from the start of the interval until the first failure and that a semester is divided by midterm period.
e. Calculate the probability that there will be a failing student within the first semester.
f. Calculate the probability that a failing student will be first spotted after midterm up to end of the first semester?

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