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The following table gives the distribution of the life time of 400 neon lamps:
 
Life time (in hours) Number of lamps
1500-2000 14
2000-2500 56
2500-3000 60
3000-3500 86
3500-4000 74
4000-4500 62
4500-5000 48
 
Find the median life time of a lamp.
 
Answer:
 
Median =  
 
[Note: Enter the answer upto 2 decimals.]