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Monitors manufactured by TSI Electronics have life spans that have a normal distribution with a variance of 1,690,000 and a mean life span of 17,000 hours. If a monitor is selected at random, find the probability that the life span of the monitor will be more than 14,919 hours. Round your answer to four decimal places.
 

µ = 17000
σ = sqrt(1690000) = 1300
P(X > 14919)
z=  (14919-17000)/1300= -1.60
p(Z < -1.60) =  0.0548
p(X > 14919)  = 1 – 0.0548 = 0.9452
 

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