Math Calculator help

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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?

  • Math Calculator help -

    assume that a normal distribution of data has a mean of 19 and a standard deviation of 4. Use the 68-95-99.7 rule to find the percentage of values that lie above 31.

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