An introduction to the normal distribution:

Basic normal distribution questions (finding a probability less than x):

How to find the mean and standard deviation for a normal distribution:

How to use the GDC for the normal distribution:

Z values and the normal distribution:

Integration and probability density functions:

How to find E(x) and Var(x) of a probability density function (pdf):

How to find the median of a pdf or cdf:

An example of finding probability from permutations:

Permutations with repeated values: