1. The following table gives the enrollments in U.S. public schools, in thousands, for selected years from 1899 and projected to 2022.
(a) What is the mean public school enrollment for these years?
(b) What is the standard deviation of the public school enrollment for these years?

2. 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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Enrollment Enrollment School Year School Year (1000s) (1000s) 1899–1900 15,503 17,814 1969–1970 45,550 41,651 40,543 1909–1910 1979–1980 1919–1920 21,578 25,678 1989–1990 1929–1930 1999–2000 46,857 49,373 1939–1940 25,434 2009-2010 1949–1950 25,111 35,182 2020-2021 52,688 53,113 1959–1960 2021-2022