If you do not take any action, you will be defaulted into the Non-tobacco User Surcharge. rate. This is a self reported status, so you should take action to indicate your tobacco. user status, if applicable.
Definition of statistic for English Language Learners. : 1  a number that represents a piece of information (such as information about how often something is done, how common something is, etc.) 2  statistics : a type of mathematics that deals with the study of statistics.
Exactly as Gevorg says, we calculate statistics from the sample to make inferences about the parameters of the distribution. With respect to the idea of a sufficient statistic, informally a sufficient statistic is a complete summary of the information in a sample about some parameter of the distribution. From your example, if we assume that the variance of the Gaussian is known, then the sample mean is a sufficient statistic. If you know the sample mean, you have all the information in the sample about the population mean. If you don't know the variance, then the sample mean and the sample variance are sufficient.