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?
a. 0.1151
b. 10.69%
c. 50%
d. 68.98%
e. 11.51%
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