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The lifetime of lightbulbs that are advertised to last for 5800 hours are normally distributed with...

The lifetime of lightbulbs that are advertised to last for 5800 hours are normally distributed with a mean of 6100 hours and a standard deviation of 150 hours. What is the probability that a bulb lasts longer than the advertised figure?

Math   Statistics-And-Probability   
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Answer #1

µ = 6100

sd = 150

                              

                               = P(Z > -2)

                               = 1 - P(Z < -2)

                               = 1 - 0.0228

                               = 0.9772

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