You are planning to call 8 of your relatives on the first day of Ramazan Holiday. On this day the communication network is really busy and the chances that you can make a call are 0.35 if you try every 15min (you make only one attempt every 15 min). At each attempt, the chances that you reach your relative are independent from the outcomes of previous attempts. a) What are the chances that you can successfully reach out to 4 of your relatives making 5 call attempts? b) How much time do you expect it will take you till you reach out to your first relative? c) If you start calling at 08:00am in the morning and try regularly every 15 min, at what time do you expect to have called all of your 8 relatives? d) What are the chances that you will reach out to no more than 3 relatives within 2 hours.s hours?

Operations Research : Applications and Algorithms
4th Edition
ISBN:9780534380588
Author:Wayne L. Winston
Publisher:Wayne L. Winston
Chapter20: Queuing Theory
Section20.11: The M/g/s/gd/s/∞ System (blocked Customers Cleared)
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You are planning to call 8 of your relatives on the first day of Ramazan Holiday. On this day the communication network is really busy and the chances that you can make a call are 0.35 if you try every 15min (you make only one attempt every 15 min). At each attempt, the chances that you reach your relative are independent from the outcomes of previous attempts.
a) What are the chances that you can successfully reach out to 4 of your relatives making 5 call attempts?
b) How much time do you expect it will take you till you reach out to your first relative?
c) If you start calling at 08:00am in the morning and try regularly every 15 min, at what time
do you expect to have called all of your 8 relatives?
d) What are the chances that you will reach out to no more than 3 relatives within 2 hours.s hours?

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