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The following table gives the distribution of the life time of 400 neon lamps :

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The following table gives the distribution of the life time of 400 neon lamps :

Find the median life time of a lamp.

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Class interval having median is = (3000 – 3500) 

l = 3000, n = 400, f = 86, cf = 130, h = 500

= 3000 + 406.98 

∴ Median = 3406.98 hours

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