: The given data is not having continuous class intervals. So, we have to add and subtract 0.5 to upper class limit and lower class limit.
Median class = 144.5-153.5
l = 144.5, h = 9, f = 12 and F = 17
Median = l + * h
= 144.5 + ( * 9
= 144.5 +
So, median length is 146.75 mm.
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A data has 25 obsRS Aggarwal - Mathematics