1. Which of the following is not true about arrivals?Arrivals that are independe

1. Which of the following is not true about arrivals?Arrivals that are independent of each other are random.Random arrivals cannot be predicted exactly.The Poisson distribution is often used to represent arrival pattern.The exponential distribution is often used to represent arrival patterns.2. Given an activitys optimistic most likely and pessimistic time estimates of 4 12 and 18 days respectively compute the PERT variance for this activity.2.335.448.0064.00none of the above3. Consider a project that has an expected completion time of 60 weeks and a standard deviation of five weeks. What is the probability that the project is finished in 70 weeks or less (round to two decimals)?0.980.480.500.02none of the above4. The term queue discipline describes the:degree to which members of the queue renege.sequence in which members of the queue arrived.degree to which members of the queue are orderly and quiet.sequence in which members of the queue are serviced.all of the above.