# Standard Deviation Example (continued)

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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 | -1 | 1 |

7 | -3 | 9 |

11 | 1 | 1 |

13 | 3 | 9 |

10 | 0 | 0 |

Total | 20 |

The standard deviation is about 2.23.