3. Buses arrive according to a Poisson process with mean (1/10) within a minute. Let W be the waiting time from time t = 0 till the arrival of the second bus. Which of the following statements is true? A. E(W)=10 B. E(W)=1/10 C. W follows Poisson distribution D. W follows Binomial Distribution. 4. Let X follows Gamma Distribution with mean 5 and variance 25. What is the value of P(X=5)? A. 1/(5e) B. e/5 C. 5 D. Other, please specify: