Q4 of 50 Page 145

The production of electric bulbs in different factories is shown in the following table. Find the median of the productions.


⇒ N = 105



⇒ 52.5 Lies in class 50-60


⇒ Median class 50-60


L = lower limit of median class = 50


N = sum of frequencies = 105


h = class interval of median class = 10


f = frequency of median class = 20


cf = cumulative frequency of class preceding median class = 47


⇒ Median


⇒ Median


⇒ Median = 52.75


⇒ In thousands = 52.75× 1000 = 52750 lamps


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