Life expectancy of computer terminal

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The life expectancy of computer terminals is normally distributed with a mean of 4 years and a standard deviation of 10 months. Please answer the following questions.

A. What is the probability that a randomly selected terminal will last more than 6 years

 

B. What percentage of terminals will last 3.4 years?

C. What percentage of terminals will last between 2.5 and 4.5 years?