In the last section we computed the area under the bell curve.
The bell curve is an incredibly important tool
in probability and statistics.
In probability and statistics, the area under the whole curve
just gets us started.
Typically what we really want to know
is the area under a portion of the curve.
But there is no explicit formula for this integral.
So what we do is make numerical approximations.
In this section you'll learn how to compute
integrals numerically.
In fact, it turns out that most integrals,
and solutions to differential equations,
cannot be expressed with formulas.
Numerical integration is the only way to compute them.