the percentage of tubes, lifetime of which do not exceed 600 hrs is (a)20% (b)29.5% (c)35% (d)none of the above (hint :600-699 hrs- number of tubes 76)
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Most recently, tubes are certain percentage that has to configure and assumed to get into normal preparation.
Actually, it has 35% of the perforation when it exceeds 600 hrs and reaching the average level and marks it instantly.
The average percentage may be carrying out with results taken with the help of tubes.
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