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Manufacturer of batteries routinely tests its products to determine lifetime​ (hours of continuous​ usage). suppose they select a sample of 30 aaa batteries and find that the average lifetime is 1500 hours.
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Manufacturer of batteries routinely tests its products to determine lifetime​ (hours of continuous​ usage). suppose they select a sample of 30 aaa batteries and find that the average lifetime is 1500 hours.

User Santubangalore
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50 hours for one battery
User Asolvent
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