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A manufacturer knows that their items have a normally distributed lifespan, with a mean of 8.4...

A manufacturer knows that their items have a normally distributed lifespan, with a mean of 8.4 years, and standard deviation of 2.5 years. If you randomly purchase one item, what is the probability it will last longer than 15 years?

Math   Statistics-And-Probability   
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Answer #1

µ = 8.4

sd = 2.5

                        

                         = P(Z > 2.64)

                         = 1 - P(Z < 2.64)

                         = 1 - 0.9959

                         = 0.0041

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