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
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2019-10-02T09:44:25-0400
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