The Expected (Mean)life of a Particular Type of Light Bulb

question 73

Multiple Choice

The expected (mean) life of a particular type of light bulb is 1,000 hours with a standard deviation of 50 hours.The life of this bulb is normally distributed. What is the probability that a randomly selected bulb would last fewer than 940 hours?

• A) 0.3849
• B) 0.8849
• C) 0.1151
• D) 0.6151
• E) 0.6563

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Definitions:

Epileptic Seizures

Episodes of abnormal electrical activity in the brain leading to various symptoms such as convulsions, sensory disturbances, or loss of consciousness, indicative of epilepsy.

Cerebral Cortex

The outermost layer of the brain, involved in high-level functions such as thought, memory, and consciousness.

Auditory Area

A region of the brain, specifically located in the temporal lobe, that is responsible for processing auditory information received from the ears.

Temporal Lobe

A region of the brain located beneath the lateral fissure on both cerebral hemispheres, involved in processing auditory information and encoding memory.