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Q.

Formula for grouped data of median is


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a

l×N2-ff

b

l+N2-cff×C

c

     of these 

d

N2-ff×C

answer is B.

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Detailed Solution

We have to find the formula for grouped data of median.
Formula for group data of median =l+N2-cff×C Where,
l is the lower-class boundary of the group containing the median
N is the total number of values
cf is the cumulative frequency of the groups before the median group
f is the frequency of the median group
C is the group width.
Thus, the formula for grouped data of median is l+N2-cff×C.
Hence, the correct option is 2.
 
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Formula for grouped data of median is