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:

Efficiency

Refers to the ability to achieve a desired result without wasted energy or effort.

Contingency Design

The planning and creation of systems, processes, or structures that are adaptable to varying conditions and unforeseen situations.

Systematic Experimentation

Systematic Experimentation is an organized method of investigating variables and testing hypotheses in a controlled environment to gain insights or optimize outcomes.

PDCA Cycle

A four-step management method used in business for the control and continuous improvement of processes and products; it stands for Plan-Do-Check-Act.