Homework Help: Math Calculator help

Posted by HM on Friday, November 25, 2011 at 3:40pm.

Assume that a normal distribution has a mean of 21 and a standard deviation of 2.
Use the empirical rule to find the percentage of values that lie above 23.

Now I did this on the Ti 83 by using Normalcdf(-5,1) and getting an answer of 0.84 and then 1-0.84 and I get about 15.9 in percentage but it is showing me wrong.
Help me I am confused.
Where am I going wrong?

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