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.
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Answered by
78
Solution:-
(1) Individual Series : (In ascending order)
(X) (X)
15 20
15 21
15 22
16 22
16 22
16 22
17 23
18 24
18 24
18 24
18 25
19 25
20 25
20 25
(2) Discrete Series :
(X) (f)
15 3
16 3
17 1
18 4
19 1
20 3
21 1
22 4
23 1
24 3
25 4
(3) Continuous Series : (Excluding upper limit)
Class Interval f
15 - 17 6
17 - 19 5
19 - 21 4
21 - 23 5
23 - 25 4
25 - 27 4
(4) Cumulative Frequency Series : (Less Than Series)
Less Than c. f.
Less than 15 3
Less than 17 7 (4 + 3)
Less than 19 12 (5 + 7)
Less than 21 16 (4 + 12)
Less than 23 21 (5 + 16)
Less than 25 28 (7 + 21)
(1) Individual Series : (In ascending order)
(X) (X)
15 20
15 21
15 22
16 22
16 22
16 22
17 23
18 24
18 24
18 24
18 25
19 25
20 25
20 25
(2) Discrete Series :
(X) (f)
15 3
16 3
17 1
18 4
19 1
20 3
21 1
22 4
23 1
24 3
25 4
(3) Continuous Series : (Excluding upper limit)
Class Interval f
15 - 17 6
17 - 19 5
19 - 21 4
21 - 23 5
23 - 25 4
25 - 27 4
(4) Cumulative Frequency Series : (Less Than Series)
Less Than c. f.
Less than 15 3
Less than 17 7 (4 + 3)
Less than 19 12 (5 + 7)
Less than 21 16 (4 + 12)
Less than 23 21 (5 + 16)
Less than 25 28 (7 + 21)
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