The Life (In Hours)of Light Bulbs of a Certain Brand

question 77

Multiple Choice

The life (in hours) of light bulbs of a certain brand is normally distributed with mean 1200 and standard deviation 100.What percentage of such bulbs will burn more than 1250 hours?

• A) 13.62
• B) 20.47
• C) 30.85
• D) 41.73
• E) 48.26

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Definitions:

Stress

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A branch of psychology that focuses on how biological, psychological, and social factors affect health and illness.

Gestalt

A psychological approach emphasizing the holistic and innate patterns of perception and problem-solving as opposed to analyzing components individually.