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 is an English locational surname. It derives from one of the villages called Dunham in the county of Nottingham, or Dunham Magna and Dunham Parva, in Norfolk, or Dunham on the Hill, in both Norfolk and Cheshire.The origin is the pre 7th century Olde English dun meaning a hill and ham, a hamlet or homstead.arly examples of the surname recording include those of Edwarde Dunham at the village of North Elmham in Norfolk, on October 9th 1546, during the reign of King Henry V111 (!510 - 1547), and in Cheshire that of Thomas Donham, a witness at the town of Nantwich on November 5th 1790.