NORMSINV is an Excel function used along with normal distributions. It allows you to conduct calculations faster and with more precision than by doing them by hand. Further, you can use NORMDIST to ...

The need for numerical tables of $\int e^{-t^{2}}\mathit{dt}$ dt, especially in astronomy and probability theory, was recognized by Laplace as early as 1783, and the first such table was constructed ...