The Life Expectancy of Computer Terminals Is Normally Distributed with a Mean

question 18

Short Answer

The life expectancy of computer terminals is normally distributed with a mean of 4 years and a standard deviation of 10 months.
a.What is the probability that a randomly selected terminal will last more than 5 years?
b.What percentage of terminals will last between 5 and 6 years?
c.What percentage of terminals will last less than 4 years?
d.What percentage of terminals will last between 2.5 and 4.5 years?
e.If the manufacturer guarantees the terminals for 3 years (and will replace them if they malfunction), what percentage of terminals will be replaced?

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Definitions:

Parental Monitoring

The actions taken by parents to keep track of their children’s activities and behavior, intending to guide or protect them.

Private School

An educational institution not administered by local, state, or national governments, often funded through tuition fees and gifts.

High-Risk Neighborhood

An area with heightened levels of danger and vulnerability, often due to factors like crime, poverty, and lack of resources.

Parental Involvement

The participation of parents in their children's education and school activities, which is considered crucial for children's academic success and social development.