Suppose the Life of a Particular Brand of Calculator Battery

question 40

Multiple Choice

Suppose the life of a particular brand of calculator battery is approximately normally distributed with a mean of 75 hours and a standard deviation of 10 hours. What is the probability that 16 randomly sampled batteries from the population will have a sample mean life of between 70 and 80 hours?

• A) 0.9444
• B) 0.5121
• C) 0.7124
• D) 0.1512

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Definitions:

Ileum

The final and longest segment of the small intestine, where most of the absorption of nutrients and water takes place.

Duodenum

The first and shortest section of the small intestine, where a significant part of digestion occurs.

Helicobacter Pylori

A type of bacteria that infects the stomach lining and is one of the leading causes of ulcers and stomach inflammation.

Peptic Ulcers

sores that develop on the lining of the stomach, lower esophagus, or small intestine, usually due to infection or chronic use of anti-inflammatory medications.