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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