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.
But it wasn't until 1966 that President Lyndon B. Johnson declared, by presidential proclamation, the third Sunday in June to be Father's Day. On June 15, 1966, President Johnson declared Father's Day to be a time to give public and private expression of the love and gratitude owed to the nation's fathers.