There are two types of A9 processors for iPhone 6s: 

The TSMC A9 processor and the Samsung A9 processor. Assume the Apple store at Festival Walk released 40 iPhone 6s on one day, 30 of which are with the TSMC A9 processors, and 10 of which are with the Samsung A9 processors. Suppose that you buy 2 iPhone 6s from the Apple store at Festival Walk, which are randomly picked from the 40 iPhone 6s.

1. (a) Find the probability that none of the iPhone 6s that you bought is with the Samsung A9 processor. (2pts)
   (b) Find the probability that at least 1 of the iPhone 6s that you bought is with the Samsung A9 processor(s). (2pts)
2. (c) If any of the iPhone 6s that you purchased is with the Samsung A9 processor, then you return them to the store and swap for iPhone 6s with TSMC A9 processor (you can swap both, if needed). The iPhone(s) you get by swapping will be picked randomly from the remaining ones in the store. Also suppose that you could only return to the store at most once. Further assume that no iPhone 6s is sold or swapped before you return to the store. What is the probability that you end up with 2 iPhone 6s with TSMC A9 processors? (4pts)

Answer rating: 100% (QA)

a The probability that none of the iPhone 6s that you bought is with the Samsung A9 processor is com... View the full answer