The following table gives the percentage of on-time arrivals in airports in a certain country from 2004 through 2013.

Year	2004	2005	2006	2007	2008	2009	2010	2011	2012	2013
On-time Arrivals (%)	76.63	74.85	77.61	70.83	71.05	80.19	77.25	75.96	85.43	80.83

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.) ______ %