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Question

The Marks obtained ( out of 20) by 30 students of class in a test are as follows : 14,16,15,11,15,14,13,16,8,10,7,11,18,15,14,19,20,7,10,13,12,14,15,13,16,17,14,11,10,20. Prepare a frequency distribution table for the above data using class intervals of equal width in which one class interval is 48 ( excluding 8 and including 4).

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Solution


In this table class intervals are such that Lower limit is included and upper limit is not included in the class.
That means In interval (48), 4 is included but 8 is excluded.
And for frequency we counted how many times number from the interval occurs in given data.

Class interval Frequency
48 2
812 7
1216 13
1620 6
2024 2
Total 30




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