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.
Recorded as Hadingham, Headingham, and Hedingham, this is an English locational surname. It almost certainly originates from the twin villages of Castle and Sible Hedingham in the county of Essex. Locational surnames are usually from names.hat is to say surnames given to people after they left their original homes and moved elsewhere, usually in search of work. This certainly applies here, as with the exception of two early recordings in 1732 shown below and 1780, the surname is rarely ever recorded in its home county of Essex.