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Answer to Question #46251 in Statistics and Probability for Divyashree Bhat

Question #46251
In a test on electric bulbs, it was found that the life time of a
particular brand was
normally distributed with an average life of 2000 hours and S.D. of 60 hours. If a
firm purchases 2500 bulbs, find the number of bulbs that are likely to last for (i)
more than 2100 hours, (ii) less than 1950 hours and (iii) betwe
en 1900 and 2100
hours.
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