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.
Standard deviation is a statistical value used to determine how spread out the data in a sample are, and how close individual data points are to the mean â or average â value of the sample. A standard deviation of a data set equal to zero indicates that all values in the set are the same.