Question

In the class intervals 10-20, 20-30, the number 20 is included in the class ________.

Answer 1

In the exclusive method of classification, the class intervals are so fixed that the upper limit of one class is the lower limit of the next class. Here, the upper limit of the class is not included in the class. It is included in the next class.

The given class intervals are 10–20, 20–30. Here, 20 is the upper limit of the class 10–20. So, it is not included in this class. The number 20 is included in the class interval 20–30.

In the class intervals 10–20, 20–30, the number 20 is included in the class __20–30__.