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Find z such that 9% of the area under the standard normal curve lies to the right of z.


Find z such that 9% of the area under the standard normal curve lies to the right of z. 


Find z such that 58% of the standard normal curve lies between -z and z. 


Future Electronics makes compact disc players. Its research department found that the life of the laser beam device is normally distributed, w 470 hours. 

(a) Find the probability that the laser beam device will wear out in 5000 hours or less.

math   Statistics-And-Probability   
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