Relative frequency is the proportion 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.
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 |