The table gives the private school enrollments as percents of total school enrollment (actual and projected) for selected school years from 1899–1900 to 2021–2022. Find the mean and standard deviation of the percents of private school enrollments for the given school years.

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School Year % Private School Year % Private 1899-1900 8.0 1969–1970 10.8 1909-1910 8.0 1979–1980 10.7 1919-1920 7.3 1989–1990 12.1 1929-1930 9.4 1999–2000 11.4 1939–1940 9.3 2009-2010 9.8 1949–1950 11.9 2020-2021 9.1 1959–1960 13.9 2021-2022 9.1