How classes can be formed while presenting the data?

Answer»

Classes can be formed in two ways:

1. Exclusive type

2. Inclusive type

1. Exclusive type:

When the class intervals are so fixed that the upper limit of one class is the lower limit of the new class, it is known as the exclusive method of classification.

Example:

Marks (Percentage)	No. of. Students
0 -10	15
10 - 20	17
20 - 30	22
30 - 40	30
40 - 50	39

2. Inclusive Type:
Under this method the upper class limit of the frequency class will not become the lower limit of next class. This type of classification is called as Inclusive type.

Marks (percentage)	No. of. Students
0 - 9	5
10 - 19	8
20 - 29	7
30 - 39	10
40 - 49	12

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How classes can be formed while presenting the data?

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