Mean. The mean of an observation variable is a numerical measure of the central location of the data values. It is the sum of its data values divided by data count. Hence, for a data sample of size n, its sample mean is defined as follows:Similarly, for a data population of size N, the population mean is:ean. The mean of an observation variable is a numerical measure of the central location of the data values. It is the sum of its data values divided by data count. Hence, for a data sample of size n, its sample mean is defined as follows:
Names of territorial origin were common, a man would have had the surname Langford if he was from the village of Langford. An example of this is Osm' de Langeford who was recorded in the Pipe Rolls for Wiltshire in 1130. The name Osm' de Langeford means Osm' from the village of Langford.
The first recorded spelling of the family name is shown to be that of one Baldwin Tuckere in the 1236 Records of Battle Abbey in Sussex. Nevertheless, one should not be too hasty to assign English origin to bearers of the surname.he origin of the name is not entirely certain, but since it has a long history as a surname on the continent, as in England and from thereon, also in the United States, it presumably has the same Saxon roots.