in a test on 200 electric bulbs , it was found that life particular make,was normally distributed with an average life of 2040 hours standard deviation of hours estimate the number of bulbs likely to burn for i) more than 2140hrs ii)between 1920 and 2080 hours iii)less than 1960 hours
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9th Jun, 2020
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https://hemantmore.org.in/mathematics/statistics/normally-distributed/14360/
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