The following table gives the percentage of on-time arrivals in airports in a certain country from 2004 through 2013. 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 Year On-time Arrivals (%) 76.03 74.25 77.01 70.23 70.45 79.59 76.65 75.36 84.83 80.23 Find the average percentage of on-time arrivals over the 10 years from 2004 through 2013. What is the standard deviation for these data? (Round your answer to two decimal places.)

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