**
Description:**

This calculator determines the area under the standard normal
curve given z-Score values. The area represents probability
and percentile values. The calculator allows area look up
with out the use of tables or charts. In addition it provide
a graph of the curve with shaded and filled area.

The z-score is the number of standard deviations from the
mean.

The standard normal distribution is a normal distribution
with a standard deviation on 1 and a mean of 0.