Students of Class XI obtained following marks in Economics. Classify the data in the form of individual series, discrete series, continuous series and cumulative frequency series.
15
15
18
16
20
21
25
25
15
16
18
22
24
25
20
18
22
24
24
25
25
23
20
15
16
17
19
18
22
22
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I don't know
so sorry
so ...
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