Question 5:
Find the following table gives the distribution of the life time of 400 neon lamps:
Find the median life time of a lamp.
Answer:
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
Therefore, median life time of lamps is 3406.98 hours.
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