I need help this problem. I'm trying to learn how to do the problem 85.

Problem 85 Easy Difficulty Jump To Question Suppose x is a random variable for which a Poisson probability distribution with 1 = 3 provides a good characterization. a. Graph p(x) for x = 0, 1, 2, ..., 9. b. Find y and o for x, and locate / and the interval / + 20 on the graph. c. What is the probability that x will fall within the interval u + 20?Problem 89 Easy Difculty Jump To Question ' Spare line replacement units. The U.S. Department of Defense Reliability Analysis Center publishes Selected Topics in Assurance Related Technologies (START) sheets to help improve the quality of manufactured components and systems. One START sheet, titled "Application of the Poisson Distribution" (Vol. 9, No. 1,2002 ), focuses on a spare line replacement unit (LRU). The number of LRUs that fail in any 10,000 -hour period is assumed to follow a Poisson distribution with a mean of 1.2 . a. Find the probability that there are no LRU failures during the next 10,000 hours of operation. b. Find the probability that there are at least two LRU failures during the next 10,000 hours of operation