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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"?
b) Find the Variance. Is the first "a" in a message being the 30
th
character realistic?

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