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.
The standard deviation of a population gives researchers the amount of dispersion of data for an entire population of survey respondents. A population standard deviation represents a parameter, not a statistic. Parameters refer to a numerical property of a population.