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.
Six years later, the day was made a permanent national holiday when President Richard Nixon signed it into law in 1972. In addition to Father's Day, International Men's Day is celebrated in many countries on November 19 for men and boys who are not fathers.