High Accurate Simple Approximation of Normal Distribution Integral

<table>(a) (<a href="https://static.hindawi.com/articles/mpe/volume-2012/124029/figures/#EEq11">2.11</a>) and exact function <svg height="19.924999" id="M43" style="vertical-align:-3.276pt" version="1.1" viewbox="0 0 77.574997 19.924999" width="77.574997" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,15.775)"><use xlink:href="#x65"></use></g><g transform="matrix(.017,-0,0,-.017,7.287,15.775)"><use xlink:href="#x78"></use></g><g transform="matrix(.017,-0,0,-.017,15.31,15.775)"><use xlink:href="#x70"></use></g><g transform="matrix(.017,-0,0,-.017,29.878,15.775)"><use xlink:href="#x28"></use></g><g transform="matrix(.017,-0,0,-.017,35.76,15.775)"><use xlink:href="#x2212"></use></g><g transform="matrix(.017,-0,0,-.017,45.738,15.775)"><use xlink:href="#x1D70B"></use></g><g transform="matrix(.017,-0,0,-.017,55.784,15.775)"><use xlink:href="#x1D465"></use></g>
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</svg>. (b) Relative error.</table>

Mathematical Problems in Engineering

High Accurate Simple Approximation of Normal Distribution Integral

Figure 2