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).

With standard deviation at 1.91 percent, it suggests that the range is plus or minus 1.91 percentage points from the average, meaning that Apple’s returns tend to range from -1.83 percent to 1. ...

First, let's look at what a standard deviation is measuring. Consider two small businesses with four employees each. In one business, two employees make $19 an hour and the other two make $21.

Correction— Oct. 20, 2024: This article has been corrected to give the correct formulas for calculating standard deviation and variance. Article Sources.

Calculating standard deviation manually can be time-consuming and complex. Excel's STDEV formula can automatically calculate the standard deviation of any set of numbers, so you don't have to go ...

Use Excel to calculate daily returns and standard deviation to gauge stock volatility. Annualize volatility by multiplying daily standard deviation by the square root of 252. Remember, standard ...

Standard deviation measures how far numbers in a data set are spread out from an average value. In investing, it is used as a measurement of portfolio volatility.

Standard deviation is a measure of how far away individual measurements tend to be from the mean value of a data set. The standard deviation of company A's employees is 1, while the standard ...

The formula for annualized volatility is the standard deviation of the data multiplied by the square root of the number of time periods in the year the data is collected (i.e., 12 for a monthly ...