Probabiliy for 3.1 years?

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A survey found that people keep their televisions an average of 4.2 years. The standard deviation is 0.82 year. If a person decides to buy a new TV, find the probability that he or she owned the old one for More than 3.1 years. Assume the random variable is normally distributed.

I know I take (4.2-3.1)/.82 = 1.341463, but then I get lost at the table, and can't figure the probability from there.  I don't know how to use the table I guess :( please help.

May 30th, 2015

probability =1.341463-1

=0.341463

probability ranges from zero to 1...................................................

May 30th, 2015

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May 30th, 2015
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