Statistics

Please Help!!!

I am having a small Problem Working this Problem. I am just not understanding. Could someone please assist?

The lifetime of a brand of DVD player follows a normal distribution with
a mean of 8 years and a standard deviation of 6 months. Find the probability
that the lifetime is more than 7 years.

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asked by Stacy
  1. Z = (score-mean)/SD

    Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.

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    posted by PsyDAG

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