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.
There have been a number of explanations as to how the name Foster originated in England. The main line is that Foster is a contracted spelling of Forester, a term which described an official in charge of a forest.In the Middle Ages, the forests and woods were almost always owned or controlled by the lord of the manor.s in England, the name means forester or forest ranger. Forster may also have been an inhabitant of Forst, a town in the Rheinpfalz. For immigrants into America, the name has often been anglicized to Foster.