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.
This name is of English locational origin from any of three places thus called in Yorkshire North Riding, Cheshire or the Forest of Arden in Warwickshire. The former derives its name from the Olde English pre 7th Century earn, an eagle plus denu a valley. Hence, The valley of the eagles. The latter two places are believed to be linguistically identical with the forest of the Ardennes in France and Belgium, named from the Celtic word ard meaning high. The Warwick Ardens descended from an Anglo-Saxon nobleman called Aelfwine, who was sheriff of that county, circa 1050.