Answer :
We have, N = 420
= 
= 210
The cumulative frequency just greater than 
is 275 then 165.5-168.5 is the median class such that,
l = 165.5, f = 142, F = 133 and h = 168.5-165.5 = 3
Median = l + 
* h
= 165.5 + 
* 3
= 165.5 + 
* 3
= 165.5 + 1.63
= 167.13
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