Mathematics, 01.12.2021 21:10 terryjessicaa

2.000 electric bulbs arc installed in various offices of an organization. The bulbs have a mean life of 1,000 working hours with a variance of 40.000 hours. Now many bulbs may fail between 800 hours and 1.100 working hours?

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2.000 electric bulbs arc installed in various offices of an organization. The bulbs have a mean life...

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