A professor assigns 5 homework problems. The class has 3 TAs. For the entire class of 140 students, each problem requires an average of 2 hours to grade by each TA. The grading time for each problem by each TA is exponentially distributed, and both the problems and TAs are independent of each other. What is the probability that the TAs finish grading in a total of 10 hours?
Assuming that the TAs all work in parallel, starting at the same time, what is the probability that they finish grading in 3 hours?
Again, assuming the TAs work in parallel and start at the same time, what is the expected number of problems graded after 2 hours?
TA is the teaching assistant

Which of the following statements are true? (select all that apply.) a quasi-static process is one in which the system is never far from being in equilibrium. when a system can go from state 1 to state 2 by several different processes, the amount of heat absorbed by the system will be the same for all processes. the internal energy of a given amount of an ideal gas depends only on its absolute temperature. when a system can go from state 1 to state 2 by several different processes, the work done on the system will be the same for all processes. when a system can go from state 1 to state 2 by several different processes, the change in the internal energy of the system will be the same for all processes. for any substance that expands when heated, its cp is greater than its cv.