Relative Frequency Histogram. A relative frequency histogram uses the same information as a frequency histogram but compares each class interval to the total number of items. For example, the first interval ($1 to $5) contains 8 out of the total of 32 items, so the relative frequency of the first class interval is (see Table 1). The only difference between a frequency histogram and a relative frequency histogram is that the vertical axis uses relative or proportional frequency instead of simple frequency (see Figure 1). Figure1 .Relative frequency histogram of items sold at a garage sale.
1 The average temperature in Valparaiso, Chile is mild at 14 degrees Celsius (57.2 degrees Fahrenheit).2  Mean monthly temperatures have a variation of 5.6 C (10.1 F) which is a very low range. 3  There is a variation/ range of mean diurnal temperatures of 8.5 C (15.3 F). The average temperature in Valparaiso, Chile is mild at 14 degrees Celsius (57.2 degrees Fahrenheit).
The daily average temperature ranges from 18 Â°C (64 Â°F) in the coldest month (August), to 24 Â°C (75 Â°F) in the warmest month (February) in the north (see El Alto), from 17 Â°C to 23 Â°C (63 to 73 Â°F) in the centre (see Lima and Trujillo), and from 15 Â°C to 22 Â°C (59 to 72 Â°F) in the south, near the border with Chile (see Ilo).