The Life Expectancy of Point-Of-Sale (POS) Terminals Is Normally Distributed

question 78

Short Answer

The life expectancy of point-of-sale (POS) 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?

---

Definitions:

Extremely Suggestible

A trait indicating high susceptibility to being influenced or persuaded by external suggestions or stimuli, often leading to altered thoughts, beliefs, or actions.

Hypnosis

A trance-like state of focus and concentration that can be used for therapeutic purposes.

Actions And Thoughts

These are cognitive and behavioral processes that encompass all mental and physical activities, including decision-making, analysis, movement, and speech.

Placebo

A substance or treatment with no therapeutic effect, often used in the control group in experiments to test the effectiveness of drugs.