The Chief Design Engineer for Colonial Warning Systems Wants to Know

question 46

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.What is the probability that a lamp will perform reliably for one hour?

• A)0
• B).2
• C).8
• D).9
• E)1

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Definitions:

Culture

The shared attitudes, values, norms, practices, languages, and material objects of a society that are passed from one generation to the next.

Cephalocaudal Development

A pattern of growth where infants develop motor skills from their head down through the body to the feet.

Crawl

A movement involving the hands and knees or dragging the body along the ground.

Sit Unsupported

The ability of an individual to maintain an upright sitting position without external support.