When it comes to cars, “STD” is an abbreviation for “standard” and could have two separate meanings. On one hand, it could mean that a particular feature is standard on a given car or trim ...

Annie, do most doctors believe their patients with this STD have cheating spouses? Is it possible I carried this infection for 21 years, since my previous marriage, and am only now showing symptoms?

Standard deviation measures how far numbers in a data set are spread out from an average value. In investing, it is used as a measurement of portfolio volatility.