what are inclusive and exclusive classes?
How to make more than type and less than type frequency distribution?

@- Sanchi- good answer.

Here is the example for drawing the same.

Less than Type

More than Type

Marks

Cumulative frequencies

Marks

Cumulative frequencies

Less Than 10

7

More Than 0

60

Less Than 20

17

More Than 10

53

Less Than 30

31

More Than 20

    43      

Less Than 40

51

More Than 30

29

Less Than 50

57

More Than 40

9

Less Than 60

60

More Than 50

3
    More Than 60 0

Ogive of the above data is represented below.

 

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Inclusive Class Interval:
When the lower and the upper class limit is included, then it is an inclusive class interval. For example - 220 - 234, 235 - 249 ..... etc. are inclusive type of class intervals. Usually in the case of discrete variate, inclusive type of class intervals are used.

Exclusive Class Interval:
When the lower limit is included, but the upper limit is excluded, then it is an exclusive class interval. For example - 150 - 153, 153 - 156.....etc are exclusive type of class intervals. In the class interval 150 - 153, 150 is included but 153 is excluded.
Usually in the case of continuous variate, exclusive type of class intervals are used.
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