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The following table gives the distributi...

The following table gives the distribution of the life - time of 400 neon lamps.
`{:("Lif 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 .

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The correct Answer is:
3406.98 hours.
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