The Chief Design Engineer for Colonial Warning Systems Wants to Know

question 54

Multiple Choice

The chief design engineer for Colonial Warning Systems wants to know the reliability of a two-lamp device intended to warn the operator of potential problems with a commercial steam kettle.One (either) lamp is to be lit if steam pressure drops below the desired level,and two (both) are to be lit if temperature drops below a desired level.His supplier estimates that a lamp has a failure rate of .2 per hour of operation,and a mean wear-out time of seven years with a standard deviation of eight months.If the pressure drops below the desired level,what is the probability the system will perform reliably for one hour?

• A).04
• B).4
• C).6
• D).64
• E).96

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Definitions:

Prenatal Development

The process of growth and development inside the womb, from conception to birth, encompassing all phases of embryonic and fetal development.

Zygote

The initial cell formed when a new organism is conceived, resulting from the union of an ovum and a sperm cell.

Fetus

A developmental stage of a vertebrate that occurs in the womb after embryonic stage and until birth.

Stranger Anxiety

The fear of strangers that infants commonly display, beginning by about 8 months of age.