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

question 1

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.Which most closely reflects the probability that a randomly selected bulb would last longer than 1150 hours?

• A)0.4987
• B)0.9987
• C)0.0013
• D)0.5013
• E)0.5513

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Definitions:

Extended Childhood Period

a developmental phase in humans lasting from birth to the onset of puberty, characterized by slow growth and extensive learning.

Natural Selection

The process by which biological traits become more or less common in a population due to consistent effects upon the survival or reproduction of their bearers.

Gradual Modification

denotes the process of slow and incremental changes or adjustments, often used in the context of evolutionary biology or behavior modification strategies.

Adapted

Modified for a new use or purpose, especially in the context of items, processes, or ideas to better suit the needs or limitations.