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Find a range in which it can be guaranteed

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Reference no: EM132851182

Light bulbs manufactured by a well-known electrical equipment firm are known to have a mean life of 800 hours with a standard deviation of 100 hours.

a) Find a range in which it can be guaranteed that 84% of lifetimes of light bulbs lie.

b) Using the rule of thumb, find a range in which it can be estimated that approximately 68% of these light bulbs lie.

Reference no: EM132851182

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