Twenty students of ClassXI have secured the following marks:-
4
11,12,14,11,10,11,17,16,17,14,17,18,20,14,20,17,20,17,14,20
Present the data as a frequency array.
Answers
Answer:
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Answer:
Following table presents these data in the form of a frequency array. The table shows that 3 students secured 11 marks, 4 students secured 14 marks, again 4 students secured 20 marks, and the like. As it is clear from the table, in such series the items are arranged in the ascending (or descending) order. Frequencies are noted in front of each item to signify the number of times that the item occurs in the series. In this table, the marks secured are shown in ascending order. Against these marks are shown their frequencies, that is, the number of students who have secured these marks.
Thus, 3 is the frequency for 11, so 3 is written against it. This means 11 is occurring 3 times in the series, or 3 students have secured 11 marks. Likewise, 5 is written against 17, 5 is the frequency of 17 or 5 students have secured 17 marks.
Discrete series present the data in a very brief form. However, this type of presentation of the data becomes difficult when there is a large mass of data and a large number of small frequencies. In such situations, data are to be distributed in different classes.
Explanation:
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