âº EVC System. A disabled refuge is a relatively safe area within a building or exit staircase for mobility impaired occupants, allowing building management and emergency services to safely assist these people from the building.
Standard deviation is a number used to tell how measurements for a group are spread out from the average (mean), or expected value. A low standard deviation means that most of the numbers are very close to the average. A high standard deviation means that the numbers are spread out.
As you said standard deviation is the spread from the mean for a series of data. The wider the spread the more volatile your series of data are. The smaller the spread the less volatile your series are. Standard deviation is one of the measure used in assessing the risk associated to a company stock. just now. Report Abuse. The standard deviation is a measure of the spread of a normally distributed population. Knowing it and the mean you can calculate the proportion of the population having any particular value of the measured variable.