The standard deviation is expressed in the same units as the mean is, whereas the variance is expressed in squared units, but for looking at a distribution, you can use either just so long as you are clear about what you are using.
2322. Presidents Day (or Presidents' Day), is the common name for the federal holiday officially designated as Washington's Birthday. As the first federal holiday to honor an American citizen, the holiday was celebrated on Washington's actual birthday in 1796 (the last full year of his presidency) on February 22.
Some also dub him the Father of Flag Day. On the Washington level, Presidents Wilson and Coolidge both issued proclamations that June 14 be observed as Flag Day. But it wasnât until 1949 that Congress passed legislation to that effect and President Truman signed it into law. So Flag Day has an official date. But it is not a full-blown federal holiday.