Mathematics
Mathematics, 10.09.2019 04:10, benji2246

Question: all ships travel at the same speed through a wide canal. each ship takes t days to traverse the all ships travel at the same speed through a wide canal. each ship takes t days to traverse the length of the canal. eastbound ships (i. e., ships traveling east) arrive as a poisson process with an arrival rate of λe ships per day. westbound ships (i. e., ships traveling west) arrive as an independent poisson process with an arrival rate of λw ships per day. a pointer at some location in the canal is always pointing in the direction of travel of the most recent ship to pass it. in each part below, your answers will be algebraic expressions in terms of λe,λw, x,t, v and/or k. enter "le" for λe and "lw" for λw, and use "exp()" for exponentials. do not use "fac()" or "! " for factorials; instead, calculate out the numerical value of any factorials. follow standard notation.
4) starting at an arbitrary time, we monitor the cross-section of the canal at some fixed location along its length. let v be the amount of time that will have elapsed (since we began monitoring) by the time we observe our seventh eastbound ship. find the pdf of v. for v≥0,
5) what is the probability that the next ship to arrive causes a change in the direction of the pointer?
6) f we begin monitoring a fixed cross-section of the canal at an arbitrary time, determine the probability mass function pk(k) for k, the total number of ships we observe up to and including the seventh eastbound ship we see. the answer will be of the form pk(k)=(a6)⋅b, for suitable algebraic expressions in place of a and b.

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