4. Calculate: The standard deviation (σ) of a data set describes how closely the values in the set are bunched together. The standard deviation is listed on the SIMULATION pane. A. What is the standard deviation of this data set? B. Add and subtract the standard deviation (σ) from the mean (μ). μ + σ = μ – σ = C. How many values in the set are within one standard deviation of the mean?