The standard deviation formula for a sample is almost the same as the formula for a population, except you subtract N by 1 in the denominator, so it's: σ = √(Σ(xi - μ)² / N-1).

Were that to occur, the standard-deviation calculation would be unfair, because it would penalize fund managers for excelling at their jobs. If a fund gains 7% when the stock market rises by 5% ...

In statistics, a standard deviation is a measure of the amount of variation or dispersion of a set of values. The Syntax for the STDEV function is below: Number 1 : The first number argument that ...