Calculation of Probabilities Using the Normal Distribution

This is a calculation tool developed for use by anybody who wants to use it. It uses Simpson's Rule to calculate the approximate area under the normal curve from the mean to some X value as shown in the figure.



Normal Probability Distribution - Problem Data
1) Population Mean
2) Value of Standard Deviation
3) Value of X
Normal Probability:
5) Z value
6) Probability X is between the mean and a given value