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.