Standard Deviation (SD) is also a measure of spread and it is the σ = sqrt(σ²). The scale of SD is the same as the mean.
These thoughts were extracted from Udacity online course and cover topics such as: Visualizing relationships in data, Probability, Estimation, Outliers and Normal Distribution, Inference and Regression.
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The standard score is the signed number of standard deviations by which the value of an observation or data point is above the mean value of what is being observed or measured. Observed values above the mean have positive standard scores, while values below the mean have negative standard scores. z = (x - μ)/σ
The most important factors for a long life, I think, are partly in the genes; number two is lifestyle, which includes healthy diet and regular exercise. I walk, run and swim every day. However, I think too much exercise is also unhealthy because of over-stress; sometimes people who exercise too many hours per day die early.