Students of class XI obtained following marks in economics.- 15, 15, 18, 16, 20, 21, 25, 25, 16, 18, 22, 24, 25, 20, 18, 22, 24, 24, 25, 23, 20, 15, 16, 17, 19, 18, 22, 22.

classify the data in the form of individual series, discrete series, continuious series and cumulative frequency series.

We can classify the given data in the form of the following series.

i. Individual Series: (in ascending order)

x

x

15

15

15

16

16

16

17

18

18

18

18

19

20

20

20

21

22

22

22

22

23

24

24

24

25

25

25

25

 

ii. Discrete Series:

 

f

15

16

17

18

19

20

21

22

23

24

25

3

3

1

4

1

3

1

4

1

3

4

 

iii. Continuous Series: (excluding upper limit)

Class Interval

f

15-17

17-19

19-21

21-23

23-25

25-27

6

5

4

5

4

4

 

iv. Cumulative Series: (Less than series)

Less Than

c.f.

Less than 15

Less than 17

Less than 19

Less than 21

Less than 23

Less than 25

3

7(4+3)

12(5+7)

16(4+12)

21(5+16)

28(7+21)

 

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