The following table gives the distribution of the life time of 400 neon lamps:
Find the median life time of a lamp.
Solution:
Cumulative frequency greater than
is 216.
So, median class
Median
where, l = lower limit of median class = 3000
n = number of observations = 400
cf = cumulative frequency of class preceding the median class = 130
f = frequency of median class = 86
h = class size (assuming class size to be equal) = 500
Median
hours
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