Median is middle value
i.e frequency at left of median = frequency at right of median = 0.5
We have (0 to <10) + (10 to <20) = 0.10 + 0.35 = 0.45
To make left side 0.5 we need 0.5-0.45 = 0.05 from (20 to <30) group which is 1/5th of its relative frequency 0.25
Thus, 0.05/0.25 = x / range of group (20 to <30)
Thus, 1/5 = x / 10
x = 2
Thus, median = 20+ 2 = 22
Option C
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