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. Standard deviation is a way to divide up scores that occur in a bell-shaped distribution. Typically, raw scores occur in what is called a bell curve distribution, which is when a few people score really low, a few people score really high, and most people score in the middle. The very center would be considered the average, or mean.