# Step 5: Determine Relative Frequencies

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Step 5: Determine Relative Frequencies

Relative frequency is the proportion (percentage) of a sample that belongs to a particular class. We calculate the relative frequency by dividing the class frequency by the total number of data points, n. The sum of the relative frequencies should be one, but due to rounding errors, sometimes it is not exactly one.

Absolute frequency is the actual number of times a sample belongs to a particular class. In the table below, the column labelled "Frequency" represents the absolute frequency.

**Table IV**

Actual and Relative Frequency of Serum Glucose Levels in 130 Hospital Employees

Intervals (mg/dL) | Tally | Frequency | Relative Frequency |

65 - 70 | \\ | 2 | 0.015 |

70 - 75 | 7 | 0.054 | |

75 - 80 | 16 | 0.123 | |

80 - 85 | 31 | 0.238 | |

85 - 90 | 24 | 0.185 | |

90 - 95 | 18 | 0.138 | |

95 - 100 | 13 | 0.100 | |

100 - 105 | 10 | 0.077 | |

105 - 110 | 5 | 0.038 | |

110 - 115 | \\\\ | 4 | 0.031 |

Total | n = 130 | 0.999 |