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:

Lack of Evidence

Lack of evidence refers to situations where there is insufficient data or proof to support a claim, hypothesis, or theory.

Kinesthesis

The sense that detects bodily position, weight, or movement of the muscles, tendons, and joints.

Equilibrium

A state of balance or stability within a system, or the body's sense of spatial orientation and balance.

Vilayanur Ramachandran

A neuroscientist known for his work in the fields of behavioral neurology and visual psychophysics, exploring phenomena such as phantom limbs.