2 A batch of 5000 electric lamps has a mean life of 1000 hours and a standard deviation of 75 hours Assuming a normal distribution 2 1 How many lamps will fail before 900 hours 2 2 How many lamps will fail between 950 and 1000 hours (10) (10) 2 3 And given the same mean life, what would the standa...

21 To calculate how many lamps will fail before 900 hours we need to find the zscore for 900 hours u ...

2.A batch of 5000 electric lamps has a mean life of 1000 hours and a standard...

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Elementary Statistics Picturing The World

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Elementary Statistics Picturing The World

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