Reserve Problems Chapter 4 Section 10 Problem 1 An article in Proceedings of the 2007 International Symposium on Wikis ["Cooperation and quality in Wikipedia" 2007, Pages (157-164)] used the lognormal distribution to model the number of edits per article during a period in Wikipedia. Most articles only have a small number of edits, while a small number of articles have a disproportionately large number of edits. Over a period of 240 weeks, suppose that the number of edits of the articles has approximately a lognormal distribution with = 2 and w = 1.5. (a) What is the probability that the number of edits exceeds 20? Round your answer to two decimal places (e.g. 98.76). P(X > 20) = (b) Determine the mean and standard deviation of the number of edits. Round your answers to two decimal places (e.g. 98.76). μ=> σ = (c) What number of edits is exceeded by 70% of the articles? Round your answer to the nearest integer (e.g. 9876). x= Click if you would like to Show Work for this question: Open Show Work