f(x)= height of the normal curve on the vertical axis for a valuex

x= a value on the horizontal axis

μ= mean of the normal distribution

σ= standard deviation of the normal distribution

π= 3.14159… (mathematical constant)

e= 2.71828… (mathematical constant)

If we know the mean, *μ*, and standard deviation, *σ*,
for a normal distribution, then we know everything about the distribution. We
can compute the probability of observing an *x* score above or below any
specific value. Fortunately, tables and computer programs are available to help
us find these values.