Question

How many classes should we choose? How does one decide about the size of class intervals?​

Answer 1

Answer:

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Answer 2

Answer:

For most data, 6 to 15 classes are enough. Class intervals (lengths) should be equal. Intervals such as 0.1, 0.2, 0.5, 1, 2, 5, 10, 20, 50, etc are desirable. The starting point for each class should be divisible by the interval, For example, in class 15 - 20, the starting point, 15, is divisible by the interval.