Fig 1: Excel Web App #1: standard normal probability
The trapezoid rule
$$\int_a^b f(x)~dx = \sum\limits_{i=1}^{n-1} \frac{f(x_{i+1})+f(x_i)}{2}\Delta x_i $$
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This example was developed in Excel 2013 Pro 64 bit.
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Revised:
Fig 1: Excel Web App #1: standard normal probability
$$\int_a^b f(x)~dx = \sum\limits_{i=1}^{n-1} \frac{f(x_{i+1})+f(x_i)}{2}\Delta x_i $$