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(Steps Shown) The lifetime of a DVD player is normally distributed with a mean of 8 years and a standard deviation of 38 months. What is the probability

Question: The lifetime of a DVD player is normally distributed with a mean of 8 years and a standard deviation of 38 months.

What is the probability that the DVD player that you just bought will last longer than 12 years (144 months)?
In a sample of 40 DVD players, what is the probability the average life will be greater than 9 years (108 months)?

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(Steps Shown) The lifetime of a DVD player is normally distributed with a mean of 8 years and a standard deviation of 38 months. What is the probability

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