ISTICS
289
5. 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
2500 - 3000
3000-3500
86 -
3500-4000
+2
4000 - 4500
62
4500-5000
48
Find the median life time of a lamp.
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