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. The standard deviation is the most common measure of variability, measuring the spread of the data set and. the relationship of the mean to the rest of the data. If the data points are close to the mean, indicating that. the responses are fairly uniform, then the standard deviation will be small.