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The Mean Life of a Particular Brand of Light Bulb

question 23

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The mean life of a particular brand of light bulb is 1200 hours and the standard deviation is 50 hours.It can be concluded that at least 89% of this brand of bulbs will last between _______.


Definitions:

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An abnormal connection between the trachea and the esophagus, which can lead to swallowing difficulties and respiratory problems.

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A procedure used to remove bodily secretions from the airway by applying negative pressure through a tube.

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A chronic inflammatory bowel disease that affects the lining of the digestive tract, causing pain, severe diarrhea, fatigue, weight loss, and malnutrition.

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