The article New York Citys Graffiti-Removal Response Time Rises (The Wall Street Journal,September 16, 2016, wsj.com/articles/new-york -citys-graffiti-removal
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The article “New York City’s Graffiti-Removal Response Time Rises” (The Wall Street Journal,September 16, 2016, wsj.com/articles/new-york -citys-graffiti-removal response-time-rises -1473287392, retrieved May 1, 2017) states that the city took an average of 114 days to handle graffiti complaints in 2015. Suppose that the response time is approximately normally distributed with a mean of 114 days and a standard deviation of 20 days.
a. Approximately what proportion of graffiti removal requests are handled within 60 days?
b. Approximately what proportion of graffiti removal requests take more than 120 days?
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Related Book For 
Introduction To Statistics And Data Analysis
ISBN: 9781337793612
6th Edition
Authors: Roxy Peck, Chris Olsen, Tom Short
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