Q. 185.0( 4 Votes )

The following tab

Answer :

We can find cumulative frequencies with their respective class intervals as below:

Median class = 3000-3500


l = 3000, f = 86, F = 130, h = 500


Median = l + * h


= 3000 +


= 3406.98 hours


So, median life time is 3406.98 hours.


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