Final answer:
The relative frequency is 0.2.
Step-by-step explanation:
The relative frequency of days in the 10 up to 15 class can be calculated by dividing the frequency of the 10 up to 15 class by the total number of data points. Let's assume we have a total of 100 data points and 20 of them fall within the 10 up to 15 class. The relative frequency can be calculated as:
Relative Frequency = Frequency of 10 up to 15 class / Total number of data points = 20 / 100 = 0.2