The Average Life Expectancy of Computers Produced by Ahmadi, Inc

question 62

Short Answer

The average life expectancy of computers produced by Ahmadi, Inc. is 6 years with a standard deviation of 10 months. Assume that the lives of computers are normally distributed. Suggestion: For this problem, convert ALL of the units to months.
a. What is the probability that a randomly selected computer will have a life expectancy of at least 7 years?
b. Computers that fail in less than 5 1/2 years will be replaced free of charge. What percentage
of computers are expected to be replaced free of charge?
c. What are the minimum and the maximum life expectancy of the middle 95% of the computers'
lives? Give your answers in months and do not round your answers.
d. The company is expecting that only 104 of this year's production will fail in less than 3 years and 8 months. How many computers were produced this year?

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Definitions:

Systemic Circuit

The part of the cardiovascular system that carries oxygenated blood away from the heart to the body and returns deoxygenated blood back to the heart.

Pulmonary Circuit

The part of the circulatory system that carries deoxygenated blood from the heart to the lungs for oxygenation, and returns oxygenated blood back to the heart.

Arteries

Blood vessels that carry oxygen-rich blood away from the heart to the body.

Left Ventricle

The chamber of the heart that receives oxygenated blood from the left atrium and pumps it out under high pressure through the aorta to the systemic circulation.