Probability Density Function
All probability density functions have the property that the area under the function is 1. For the triangular distribution this property implies that the maximum value of the
probability distribution function is . It occurs at the peak value of c.
The probability density function of a triangular distribution is zero for values below a
and values above b. It is piecewise linear rising from 0 at a to at c, then dropping down to 0 at b. The graph below shows the probability density function of a triangle
distribution with a=1, b=9 and c=6. The peak is at c=6 with a function value of 0.25.
a=1 c=6 b=9
The probability density function of a triangular distribution
The formula for the probability density function is