Answer to Question #95648 in Statistics and Probability for Narmadha

Question

in the product of electric bulbs, the specification of there life was found to normally distributed average life is 2100 hours and standard deviation of 80 hours. in a sample bulb find out expected number of bulbs likely so burn for (1) more than 2200 hours,(2) less than 1950 hours, (3)more than 2000 hours but less than 2150 hrs

Answer 1

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