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

Asays "we are both knaves" and b says nothing. exercises 24–31 relate to inhabitants of an island on which there are three kinds of people: knights who always tell the truth, knaves who always lie, and spies (called normals by smullyan [sm78]) who can either lie or tell the truth. you encounter three people, a, b, and c. you know one of these people is a knight, one is a knave, and one is a spy. each of the three people knows the type of person each of other two is. for each of these situations, if possible, determine whether there is a unique solution and determine who the knave, knight, and spy are. when there is no unique solution, list all possible solutions or state that there are no solutions. 24. a says "c is the knave," b says, "a is the knight," and c says "i am the spy."

Jo divides a candy bar into eight equal pieces for her children to share she gives three pieces to sam three pieces to leslie and two pieces to margie rose the two month old baby does it doesn't get any what fraction shows how muchw candy each of the four children got. what's the answer to my question

Match the following reasons with the statements given to create the proof. 1. do = ob, ao = oc sas 2. doc = aob given 3. triangle cod congruent to triangle aob vertical angles are equal. 4. 1 = 2, ab = dc if two sides = and ||, then a parallelogram. 5. ab||dc if alternate interior angles =, then lines parallel. 6. abcd is a parallelogram cpcte