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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
2000-2500
2500-3000
I Z 8 & I
3000-3500
3500-4000
4000-4500
4500-5000
Find the mean life time of a lamp.
G
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0
Answer:
mean = sum of all observation / No. of observation now fo next your own
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Answer:
hope it's helpful...................
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