1. Binomial Distribution About 52% of all US smartphone sales are iPhones. a) What is the probablity that exactly 4 of 5 smartphone owners have an Android? b) What is the probablity that 3 or fewer have an iPhone? 2. Geometric Distribution Frequency Analysis in Cryptography has found that the letter A appears about 11% of the time. a) What is the expected number of characters in a string until the first "a"? th b) Find the Variance. Is the first "a" in a message being the 30 character realistic?.