Refer to the Journal of Engineering, Computing and Architecture (Vol. 3., 2009) study of cell phone handoff behavior, Exercise 3.15. Recall that the different color codes accessed by two different model cell phones during a combined driving trip were monitored and recorded. The results (number of times each color code was accessed) are reproduced in the table below. Suppose you randomly select one point during the combined driving trips.

a. Given the cell phone used is Model 2, what is the probability that the phone is using color code 5?
b. Given that the cell phone is using color code 5 or color code 0, what is probability that the phone used is Model 1?

Data from Exercise 3.15

A “handoff” is a term used in wireless communications to describe the process of a cell phone moving from a coverage area of one base station to another. Each base station has multiple channels (called color codes) that allow it to communicate with the cell phone. The Journal of Engineering, Computing and Architecture (Vol. 3., 2009) published a study of cell phone handoff behavior. During a sample driving trip which involved crossing from one base station to another, the different color codes accessed by the cell phone were monitored and recorded. The table below shows the number of times each color code was accessed for two identical driving trips, each using a different cell phone model

Transcribed Image Text:

Color Code b ТОTAL Model 1 20 35 40 85 Model 2 15 50 6 75 ТОТAL 35 85 46 160 4, 4. 5.