View the step-by-step solution to:

Question

I'm trying to solve this question starting with problem 1, but I'm not sure how to construct the joint

distribution. I assume that we need to find $P[X_i < Y_i]$, but I do not know how to find this probability. Could you give me some advice for this? Also I would really appreciate if you give me advice how to approach to the rest of questions. Thank you!



John and Micheal are waiting at the bus stop outside of their dorm.


Unfortunately, the bus system is unreliable, so the length of these intervals are random, and follow Exponential

distributions.


John is waiting for the 51B, which arrives according to an Exponential distribution

with parameter $lambda$ . That is, if we let the random variable $X_i$ correspond

to the difference between the arrival time i th and i-1st bus (also known as the inter-arrival time)

of the 51B, $X_i sim operatorname{Expo}(lambda)$ .


Micheal is waiting for the 79, whose inter-arrival time, follows an Exponential distributions

with parameter $mu$ . That is, $Y_i sim operatorname{Expo}(mu)$ . Assume that all inter-arrival times are independent.


1.What is the probability that Micheal's bus arrives before John's bus?

  

2.After 20 minutes, the 79 arrives, and Micheal rides the bus. However, the 51B still hasn't arrived yet. Let

 Let D be the additional amount of time John needs to wait for the 51B to arrive. What is the distribution of D?


3. Lavanya isn't picky, so she will wait until either the 51B or the 79

 bus arrives. Solve for the distribution of Z, the amount of time Lavanya

 will wait before catching the bus.

  

4.Khalil arrives at the bus stop, but he doesn't feel like riding the bus with John. He

 decides that he will wait for the second arrival of the 51B to ride the bus. Find the distribution

 of $T = X_1 + X_2$ , the amount of time that Khalil will wait to ride the bus.

 [HINT: One way to approach this problem would be to compute the CDF of T and then differentiate the CDF.]

Recently Asked Questions

Why Join Course Hero?

Course Hero has all the homework and study help you need to succeed! We’ve got course-specific notes, study guides, and practice tests along with expert tutors.

-

Educational Resources
  • -

    Study Documents

    Find the best study resources around, tagged to your specific courses. Share your own to gain free Course Hero access.

    Browse Documents
  • -

    Question & Answers

    Get one-on-one homework help from our expert tutors—available online 24/7. Ask your own questions or browse existing Q&A threads. Satisfaction guaranteed!

    Ask a Question