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CBSE Class 10 Answered

how to find more than cumulative frequency ? explain with example
Asked by richaverma914 | 24 May, 2015, 10:55: AM
answered-by-expert Expert Answer
The cumulative frequency of a class is the frequency obtained by adding the frequencies of all the classes preceding the given class to the frequency of the class.
 
Number of observations less than the upper boundary of a class is called "less than type" cumulative frequency of that class.
 
Number of observations more than or equal to lower boundary of a class is called "more than type" cumulative frequency of that class.
 
For example,
 
begin mathsize 18px style table row cell Class space left parenthesis M a r k s right parenthesis end cell f cell C u m u l a t i v e space f r e q u e n c y end cell cell left parenthesis m o r e space t h a n space t y p e right parenthesis end cell cell M e a n i n g end cell row cell 15 minus 25 end cell 3 cell 42 plus 3 equals 45 end cell blank cell M a r k s space o f space 45 space s t u d e n t s space a r e space 15 space o r space m o r e space t h a n space 15 end cell row cell 25 minus 35 end cell 6 cell 36 plus 6 equals 42 end cell blank cell M a r k s space o f space 42 space s t u d e n t s space a r e space 25 space o r space m o r e space t h a n space 25 end cell row cell 35 minus 45 end cell 16 cell 20 plus 16 equals 36 end cell blank cell M a r k s space o f space 36 space s t u d e n t s space a r e space 35 space o r space m o r e space t h a n space 35 end cell row cell 45 minus 55 end cell 20 20 blank cell M a r k s space o f space 20 space s t u d e n t s space a r e space 45 space o r space m o r e space t h a n space 45 end cell row cell T o t a l end cell 45 blank blank blank end table end style
Answered by Rashmi Khot | 25 May, 2015, 09:10: AM

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