I . Interval estimation of a population mean, population standard deviation known The 2008 Workplace Productivity Survey. commissioned by LexisNexis and prepared by WorldC-ne Research, included the question. \"During the average workday. how many:' hours do you spend conduch'ng online research?\" Let x = the number of hours a legal professional spends on online research during a typical workday. Suppose that x is r'IOI'ITIallY distributed with a known standard deviation of 5. A sample of 250 legal professionals was surveyed, and the sample's mean response was 2.? hours. Use the sample inforrnaon to estimate u, the mean number of hours a legal professional spends on online research during a typical workday. The sampling distrihuon of i is normal with a mean of 2.? v and a standard deviation of 0.3162 V .