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.
He established a Christian settlement to the south of Lake Constance, and the name was taken in Czechoslovakia as Havel, and into Poland as Gawel. Early examples of the surname include Adam Galle (of Warwickshire, in 1221, William Gaw of Perthshire in Scotland in 1397, and Alexander Gawensone on Nairn in 1563.The first recorded spelling of the family name is shown to be that of Walter Galle.This was dated 1170, in the transcripts of charters relating to the Gilbertine Houses, of Lincolnshire. This was during the reign of King Henry 11nd of England, 1154 -1189.he surname is also found early in Lincolnshire, where it is of Breton origin, being introduced there by Norman settlers. Secondly, however, the name may derive from a given name derived from the Latin word gallus, meaning a cockerell. Its popularity was due to the fame of a 7th century Irish monk called St. Gall.