1.[4.72/4.84] A corporate Web site contains errors on 50 of 1000 pages . If 100 pages are sampled randomly, without replacement, approximate the probability that at least 1 of the pages in error is in the sample.

2.[Ex 4.21/Ex 4.21] In a large corporate computer network, user log-ons to the system can be modeled as a Poisson process with a mean of 25 log-ons per hour. What is the probability that there are no log-ons in an interval of 6 minutes? What is the probability that the time until next login is between 2 and 3 minutes? Find the time interval when the probability of no logon within the interval is 0.90?

3.[Ex 4.21/Ex 4.21] In a large corporate computer network, user log-ons to the system can be modeled as a Poisson process with a mean of 25 log-ons per hour. What is the probability that there are no log-ons in an interval of 6 minutes? What is the probability that the time until next login is between 2 and 3 minutes? Find the time interval when the probability of no logon within the interval is 0.90?