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Find the median life time of a lamp.
Asked by Asheesh Last Modified
Answer 
Abhay
The cumulative frequencies with their respective class intervals are as follows.
It can be observed that the cumulative frequency just greater than 
is 216, belonging to class interval 3000 − 3500.
Median class = 3000 − 3500
Lower limit (l) of median class = 3000
Frequency (f) of median class = 86
Cumulative frequency (cf) of class preceding median class = 130
Class size (h) = 500
Median 
= 3406.976
Therefore, median life time of lamps is 3406.98 hours.
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