The Chief of the Design Team for a New Missile

question 47

Multiple Choice

The chief of the design team for a new missile wants to know the reliability of its guidance system.This system is comprised of three components: a gyroscope,which has a random failure rate of 3 in every 10 launches; a computer,which has a random failure rate of 2 in every 10 launches; and a rocket motor,which has a random failure of 1 in every 10 launches.If the battery used to power the computer has a mean time to fail of 60 minutes with a standard deviation of 20 minutes,what is the probability that it will last for a launch of 30 minutes duration without failing?

• A)0.9332
• B)0.8664
• C)0.5668
• D)0.4332
• E)0.0668

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Definitions:

Implantation

The process by which a fertilized egg attaches to the lining of the uterus to begin pregnancy.

Corpus Luteum

The corpus luteum is a temporary endocrine structure in female ovaries that is involved in the production of relatively high levels of progesterone, some estrogens, and other hormones during the menstrual cycle.

Cervical Cancer

Form of cancer that is often caused by the human papillomavirus (HPV); vaccinations are available to reduce risk.

Ovarian Cancer

Form of cancer that affects the uterus; often difficult to diagnose due to a lack of symptoms.