The standard deviation is a measure of the amount of variability or dispersion of a set of data values. It tells you how much the individual data points deviate from the mean of the data. The formula for calculating the sample standard deviation is:

s = sqrt((Σ(x – x̄)^2) / (n – 1))

where s is the sample standard deviation, x is each data point in the sample, x̄ is the sample mean, Σ represents the sum of the values, and n is the sample size.

To calculate the population standard deviation, you would use the same formula but with n instead of n-1 in the denominator.

Alternatively, you can use a calculator or software program to calculate the standard deviation for you.