Use the confidence level and sample data to find the margin of error E. Round your answer to the same number of decimal places as the sample mean unless otherwise noted. o is Known. Replacement times for washing machines: 90% confidence; n = 43, x =9.0 years, o = 2.0 years O 1.4 yr O 2.3 yr O 0.5 yr O. 0.1 yr