Why do I have to have a Disabled Refuge EVC System? The risk assessment of a building must be carried out to âcurrent standardsâ not those when building systems were implemented and to make provision for means of escape for disabled people - The RRO, Regulatory Reform (Fire Safety) Order is Government Legislation and an act of Parliament.
standard deviation. (SD) A measure of the range of values in a set of numbers. Standard deviation is a statistic used as a measure of the dispersion or variation in a distribution, equal to the square root of the arithmetic mean of the squares of the deviations from the arithmetic mean.tandard deviation. (SD) A measure of the range of values in a set of numbers. Standard deviation is a statistic used as a measure of the dispersion or variation in a distribution, equal to the square root of the arithmetic mean of the squares of the deviations from the arithmetic mean.
standard deviation (SD) the dispersion of a random variable; a measure of the amount by which each value deviates from the mean. It is equal to the square root of the variance.For data that have a normal distribution, about 68 per cent of the data points fall within (plus or minus) one standard deviation from the mean and about 95 per cent fall within (plus or minus) two standard deviations.Symbol Ï.eviation. 1. a turning away from the regular standard or course. 2. in ophthalmology, strabismus. 3. in statistics, the difference between a sample value and the mean. axis deviation an axis shift in the frontal plane, as seen on an electrocardiogram.