The starting point for each class should be divisible by the interval For example in the class 15 - 20 the starting point 15 is divisible by the interval 5. As its name suggests average class size refers to the mean number of students per class at a given school for example 15 students per class. Recommend 0 Comment 0 person.
It is calculated as.
H size of the class interval assuming all class sizes to be equal f 1 frequency of the modal class f 0 frequency of the class preceding the modal class f 2 frequency of the class succeeding the modal class. The class width is the difference between the upper or lower class limits of consecutive classes. For most data 6 to 15 classes are enough Class intervals lengths should be equal. For example consider the classes 0 - 9 10 - 19 20 - 29and so on.