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 average summer temperature ranges from 13-24Â° C; winter temperatures are 5Â° C or below. The maximum annual temperature is about 35Â° C and the minimum is about -4Â° C. In Chile, the temperature ranges from -2 to 5Â° C in July and 21-25Â° C in January. The average rainfall measures 8-13 cm in many areas. The maximum annual precipitation over a long period of years has been 37 cm with a minimum of 5 cm. The soil is fine-textured with a moderate salt content.