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Standard Deviation Example (continued)

The first step in calculating the standard deviation is to calculate the mean, . In this case, = 10.

Now, subtract that mean from each of the data values, and then square those results:

    Table VII
    Urea Nitrogen Concentration in 5 Employees (mg/dL)
    Concentration (mg/dL)x-(x-)2
    9-11
    7-39
    1111
    1339
    1000
    Total
    20
Use this total to calculate the standard deviation:



The standard deviation is about 2.23.