[Questions 11-15] The discrete random variable (X) in consideration is the number of defective iPhone, which follows the Poisson probability distribution. The defective rate is known to be 2%. A random sample of 100 iPhones have been selected to check the quality of produced iPhones. [Answer: ] 11. How many defective iPhones do you expect from the sample of 100? A) 0.2 B) 2 C) 20 D) None 12. What is the standard deviation in the number of defective iPhones? [Answer: A) 0.02 B) 2 C) √2 D) √20 13. What is the probability that none of iPhones is defective? A) 0.0498 B) 0.1353 C) 0.7408 D) 0.8187 14. What is the probability that exactly 5 iPhones are defective? A) 0.0361 B) 0.1008 C) 0.5000 D) 0.6065 15. What is the probability that at least 1 iPhone is defective? A) 0.0498 B) 0.1008 C) 0.5000 D) 0.8647 [Answer: [Answer: [Answer: 1 -] ]

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