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 name derives from the Old French, Middle English mote, a moat, ditch or fortified stronghold, and was originally given as a topographical name to one who resided by such a fortification, or as a locational name to someone from any of the places in France named with this word.he first recorded spelling of the family name is shown to be that of William Moth, which was dated 1273, in the Hundred Rolls of Norfolk, during the reign of King Edward 1, known as The Hammer of the Scots, 1272 - 1307. Surnames became necessary when governments introduced personal taxation.