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.
Dunford is an Anglo-Saxon surname which is habitational from either Dunford Bridge, a hamlet near Penistone, in the West Riding of Yorkshire, or from Dunford House in Methley, also in the West Riding of Yorkshire.he first recorded spelling of the family name is shown to be that of Thomas Dunfurth, which was dated March 23rd 1581, christened at Thornhill by Dewsbury, Yorkshire, during the reign of Queen Elizabeth 1, known as Good Queen Bess, 1558 - 1603.