Q. 34.3( 6 Votes )

The following are the marks scored in a unit test (out of 25). Prepare a frequency distribution table, taking the class intervals as 0-4,

5-9, 10-14, 15-19, 20-24:

21,14,3,7,23,18,24,16,18,17,20,10,17,18,21,23,19,12,14,9,16,1 8,12,14,11.

From the table (i) find the mid-points of each class interval (ii) find the class interval having a maximum frequency (iii) find the range of the scores.

Answer :

(i) Mid-points of 0-4, 5-9, 10-14, 15-19, 20-24 are 2, 7, 12, 17, 22 respectively.

(ii) Here maximum frequency is 12 which is corresponding to the 15-19 class interval.

(iii) Range = Highest data value-lowest data value

Range = 24-3 = 21

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